Answer:
From Red Giant to Supernova: The Evolutionary Path ofHigh Mass Stars. Oncestars that are 5 times or moremassive than our Sun reach the red giant phase, their core temperature increases as carbon atoms are formed from the fusion of helium atoms. ... When the core contains essentially just iron, fusion in the core ceases.
Answer:
Educators' Corner
Background: Life Cycles of Stars
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The Life Cycles of Stars: How Supernovae Are Formed
It is very poetic to say that we are made from the dust of the stars. Amazingly, it's also true! Much of our bodies, and our planet, are made of elements that were created in the explosions of massive stars. Let's examine exactly how this can be.
Life Cycles of Stars
A star's life cycle is determined by its mass. The larger its mass, the shorter its life cycle. A star's mass is determined by the amount of matter that is available in its nebula, the giant cloud of gas and dust from which it was born. Over time, the hydrogen gas in the nebula is pulled together by gravity and it begins to spin. As the gas spins faster, it heats up and becomes as a protostar. Eventually the temperature reaches 15,000,000 degrees and nuclear fusion occurs in the cloud's core. The cloud begins to glow brightly, contracts a little, and becomes stable. It is now a main sequence star and will remain in this stage, shining for millions to billions of years to come. This is the stage our Sun is at right now.
As the main sequence star glows, hydrogen in its core is converted into helium by nuclear fusion. When the hydrogen supply in the core begins to run out, and the star is no longer generating heat by nuclear fusion, the core becomes unstable and contracts. The outer shell of the star, which is still mostly hydrogen, starts to expand. As it expands, it cools and glows red. The star has now reached the red giant phase. It is red because it is cooler than it was in the main sequence star stage and it is a giant because the outer shell has expanded outward. In the core of the red giant, helium fuses into carbon. All stars evolve the same way up to the red giant phase. The amount of mass a star has determines which of the following life cycle paths it will take from there.
diagram of the life cycles of low and high-mass stars
The life cycle of a low mass star (left oval) and a high mass star (right oval).
The illustration above compares the different evolutionary paths low-mass stars (like our Sun) and high-mass stars take after the red giant phase. For low-mass stars (left hand side), after the helium has fused into carbon, the core collapses again. As the core collapses, the outer layers of the star are expelled. A planetary nebula is formed by the outer layers. The core remains as a white dwarf and eventually cools to become a black dwarf.
On the right of the illustration is the life cycle of a massive star (10 times or more the size of our Sun). Like low-mass stars, high-mass stars are born in nebulae and evolve and live in the Main Sequence. However, their life cycles start to differ after the red giant phase. A massive star will undergo a supernova explosion. If the remnant of the explosion is 1.4 to about 3 times as massive as our Sun, it will become a neutron star. The core of a massive star that has more than roughly 3 times the mass of our Sun after the explosion will do something quite different. The force of gravity overcomes the nuclear forces which keep protons and neutrons from combining. The core is thus swallowed by its own gravity. It has now become a black hole which readily attracts any matter and energy that comes near it. What happens between the red giant phase and the supernova explosion is described below.
1. ____________ takes place in organelles called chloroplasts.
2. Light energy is captured by the green pigment ____________
3. Cells use oxygen to release energy during ___________
Answer: Photosynthesis
Explanation:
Answer:
Explanation:
Cells get nutrients from their environment, but where do those nutrients come from? Virtually all organic material on Earth has been produced by cells that convert energy from the Sun into energy-containing macromolecules. This process, called photosynthesis, is essential to the global carbon cycle and organisms that conduct photosynthesis represent the lowest level in most food chains (Figure 1).
The ribs articulate with the ?
of the thoracic vertebrae.
Answer:
The first rib articulates solely with the first thoracic vertebra. The head articulates with the demifacet and the tubercle articulates with the costal facet. The last three thoracic vertebrae lack transverse processes and the ribs associated with them lack tubercles.
Explanation:
Hope this helps u
Crown me as brainliest:)
Which best describes the role of chlorophyll in energy conversion?
Answer:
Explanation:
Chlorophyll absorbs light and converts it to chemical energy. ... During photosynthesis, plants absorb light energy from the sun and convert it into chemical energy in the form of glucose.
The role of chlorophyll during the process of photosynthesis is that it effectively converts the captured radiant energy (light energy) from the sun to chemical energy.
What is Chlorophyll?Chlorophyll may be defined as the type of green-colored pigment which is present in all green plants, some algae, and cyanobacteria. It is present in the chloroplast of the plant and carries out the entire process of photosynthesis.
This green-colored pigment is generally made up of porphyrin rings with magnesium being the co-factor. A chain of carbon and hydrogen is also present. This is known as the Phytol tail. The function of chlorophyll in each photosynthetic organism remains the same throughout.
Therefore, the role of chlorophyll during the process of photosynthesis is that it effectively converts the captured radiant energy (light energy) from the sun to chemical energy.
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Explain any one method of crop production which ensures high yield?
Tissues combine to form
a
cells
b
organs
с
organ systems
d
organisms
The graph shows the change in temperature of a sample of water in a closed system as thermal
energy is added over time.
150°C -
100°C
Temperature (°C)
50°C
0°C-
-50°C
10
50
60
20 30 40
Time (min)
What happens to the temperature of the water when it begins to melt?
Answer:
When you heat ice, its temperature rises, but as soon as the ice starts to melt, the temperature stays constant until all the ice has melted.
According to the graph, the temperature of the water continues to increase during the change of state. Thus, the correct option for this question is A.
What will happen if the ice melts?When the ice melts, the level of seawater would tend to be increased. This is because solid ice has tended to change its state to liquid. And now liquid may increase the density of the seawater which ultimately rises its level.
It is noted that when the temperature reaches that 0°C. For some instances of time, it will remain the same, but as time passes it tends to increase. The same principle is seen when the temperature reaches 100°C. So, it can not be said that the temperature remains at 0°C or 100°C until the changes in state.
Therefore, the temperature of the water continues to increase during the change of state. Thus, the correct option for this question is A.
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How is a polar molecule different from non polar molecule
In the Hierarchy of life there are seven levels, what are they?
Answer:
The biological levels of organization of living things arranged from the simplest to most complex are: organelle, cells, tissues, organs, organ systems, organisms, populations, communities, ecosystem, and biosphere.
Explanation:
Which of the following communities is most likely to be threatened by climate changeTropical rain forrest communitiesDeep Ocean CommunitiesHigh Mountain communities Temperate Decidous Communties
Answer:
the answer to your question would be Mountain communities I really hope this helps love you bye
Answer: High Mountain Communities
Explanation:
Ocean water is about 96.5% water. How many elements make up most of Earth’s ocean water? (Hint: Step 1. Recall and draw the structure of a molecule of water. Step 2. Count the number of unique elements.)
A one
B two
C three
D four
Answer:
d
Explanation:
Both plant and animal cells need to produce energy for cellular functions. In both types of cell, this function is carried out by the - O Nucleus O Mitochondria O Chloroplast O Vacuoles
In both plant and animal cells, energy for cellular functions is produced by the mitochondria.
What is mitochondria?It is a double-membrane bound organelle of eukaryotic organisms.Aerobic respiration occurs in these organelles.Here, oxidative phosphorylation occurs which generates ATP."It is known as the powerhouse of the cell."What is nucleus?It is the organelle that contains the eukaryotic cell's genetic material."It is known as the master of the cell."What is chloroplast?"It is known as the kitchen of the cell."Photosynthesis occurs in the organelle.To learn more about organelle, mitochondria, and aerobic respiration here,
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have this done correctly for brainliest
Answer:
1-vacuole
2-
3-chloroplasts
4-cytoskeleton
5-Mitochondrion
6-Nucleus
7-make the proteins for teh cell
8-plant cells have two additional organelles, cell walls and chloroplasts
Explanation:
I hope this helps you
Which two features are parts of a line graph? A) An x-axis B) A series of bars C) Line of best fit D)A dependent variable
PLEASE HURRY, I WILL PUT ON BRAIN LIST
Answer:
An X-axis and a Dependent Variable
Explanation:
APEX
How can some thing as massive as a Pacific plate move
Answer:
convection currents
Explanation:
convection currents in the Earths mantle allow the tectonic plates to slide and grind up against each other.
In October 2001 at the site of the World Trade Center in New York City, fires were still burning from the terrorist attacks that had brought down the buildings. The greatest danger to the respiratory system was
Answer:
toxic dust particles
Explanation:
After the World Trade Centre buildings collapsed on September 11, 2001, dust particles resulting from crushed concretes mixed with other substances formed toxic were released into the atmosphere.
And these toxic particles post the greatest danger to the respiratory system of those lacking effective personal respiratory protective equipment.
Toddlers and preschoolers may nap:
On beds, mats, or cots.
On beds.
In cribs.
On nap mats.
On cots.
Answer: mats and cots well at least in school at home i would see them sleeping in beds
Manmade global warming is caused by _______. a. pollution b. water vapor c. farms d. species extinction Please select the best answer from the choices provided A B C D
Answer:
A
Explanation:
Water would be considered an actual renewable resource and actual nonrenewable resource. Thus, option C is correct.
Why water is considered as actual renewable?Water would be considered an actual renewable. A renewable resource is a resource which can be used repeatedly and replaced naturally. Examples include oxygen, fresh water, solar energy and biomass. New resources may include goods or commodities such as wood, paper and leather.
Non renewable energy comes from sources that will run out or will not be replenished in our lifetimes-or even in many, many lifetimes. Non renewable energy sources are fossil fuels: coal, petroleum, and natural gas.
Potential renewable resource, potential nonrenewable resource, and actual renewable resource and actual nonrenewable resource. Water would be considered an actual renewable.
Therefore, Water would be considered an actual renewable resource and actual nonrenewable resource. Thus, option C is correct.
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Different species of heterotrophic unicellular organisms such as amoeba and Actinobacteria are found in freshwater sources. The feature that distinguishes amoeba from Actinobacteria is the —
a) presence of ribosome
b) ability to maintain homeostasis.
c) ability to reproduce.
d) presence of a nuclear membrane.
Answer:
A
Explanation:
Answer:
B
Explanation:
during which phase of the cell cycle does most cell growth occur
Cell growth occurs constantly throughout interphase. S phase is the time when all the cell's chromosomes are replicated so significant cell growth occurs here, but during both G1 and G2 cell growth occurs.
hope this helps
During the interphase of the cell cycle most cell growth takes place.
What is cell cycle?A cell cycle is the series of events that takes place in a cell as it grows as well as divides.
A cell spends the maximum of its time in what is referred to as interphase, where it grows, reproduces its chromosomes, along with prepares for cell division. The cell then exits interphase, goes through mitosis, and divides completely.
The cell cycle's longest phase is interphase. This is the stage at which the cell undergoes and duplicates its DNA before entering mitosis.
Chromosomes align, separate, and move into new daughter cells during mitosis. Because the prefix inter- means "between," interphase occurs between mitotic (M) phases.
Thus, the cell growth takes place in the interphase of the cell cycle, and the division takes place in the M-phase.
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True or False
Waste released by the respiratory system is only carbon dioxide
Answer:
False
Explanation: Carbon Dioxide and Water are the only two waste products released by respiration.
Help pleaseee
The cell membrane is selectively permeable, or semipermeable, meaning that
A)all substances can cross at any time.
B)large molecules can pass through without help.
C)only water can cross.
D)it only permits certain substances to cross.
Answer:
It is definitely D
Explanation:
the term semipermeable means it only allows SOME things to go through
Answer:
D, it only permits certain substances to cross.
Explanation:
This answer is similar to the one that I came across on Edge 2020
And I got it right
How do humans rely on Earth's atmosphere?
as a research scientist you discover what you believed to be a new organism you find the organism in the event of an underwater volcano what would you need to determine about the organism in order to prove that it alive
What you would need to to determine that is to look at the "organism" to see if it has
order, sensitivity or response to the environment, reproduction, adaptation, growth and development, homeostasis, energy processing, and evolution. If it does then it is a organism.
A potassium ion (K+) would most likely bond with
Which of these best explains the impact of radiation on the geosphere?
Land is heated up by the sun's energy.
Water is heated up by the sun's energy.
Water heats up the air surrounding it.
Land heats up the air surrounding it.
Answer: I believe its A: Land is heated up by the sun's energy
Explanation:
Because When the sun is Pointing at the ground for example the heat or radiation of it heats the land or ground
explain the resistence ......?? follow me gyus
Explanation:
is there multiple choice?
NEED HELP WITH THIS:
List the three components of traditional cell theory.
Answer:
Explanation:
All living things are made up of cells. Cells are the basic units of structure, function and physiology in living things. Living cells can come only from other pre-existing cells. Hope this helps!
I need a short personal paragraph on clean neighborhood for work.
All of us live in a neighbourhood or surrounding. We must keep our surroundings neat and clean. This will help us to live a healthy life. Keeping our surroundings clean will only help in the betterment of society. Waste or garbage should not be thrown anywhere, but only in trash bins. Throwing garbage all over the place will dirty our surroundings, pollute the environment. Controlling the use of plastic bags will help to keep our surroundings clean. One should use recycled and eco-friendly products like paper or jute bags instead of others. Littering causes land, air and water pollution. Greener surroundings look beautiful and reduce pollution. Dirtying our surroundings will cause harm to us. So, keep the surroundings clean, live happy and healthy lives.
HOPE IT HELPS YOU .BIO MEANS?
WHAT ARE THE TWO TYPES OF CELL
What influences the amplitude of waves
The amount of energy carried by a wave is related to the amplitude of the wave. ... Putting a lot of energy into a transverse pulse will not effect the wavelength, the frequency or the speed of the pulse. The energy imparted to a pulse will only affect the amplitude of that pulse.
