Which one of the following human activities is the greatest threat to biodiversity?

A. Habitat destruction
B. Climate change
C. Introduced species
D. Pollution
E. Overharvesting

Answer

chlorophyll

Explanation:

Chlorophyll is a pigment that gives plants their green color, and it helps plants create their own food through photosynthesis

Answer:

To perform photosynthesis, plants need three things: carbon dioxide, water, and sunlight. for photosynthesis. Carbon dioxide enters through tiny holes in a plant's leaves, flowers, branches, stems, and roots. Plants also require water to make their food.

Explanation:

Answer:  sheesh

Explanation:

Answer:

(First) 10,000--->1000--->100-->10 (fourth)

Explanation:

Each trophic levels gets reduced by factor of 10.

Thus if you start with 10,000 in first, then you end with 1000 in second, 100 in third and 10 in forth.

Potassium is most likely to be found with 6.25% of its original amount in 6 billion years because the half life of Potassium-40 is 1-1.5 billion years in graph. Thus the correct option is C.

If it half in 1 to1.5 billion years = 50% gain

1-1.5 billion years = 25%. gain

If we do that 2 more times we will get 12.5% and then 6.25% gain.

Half life is defined as the time required for half of the atoms of a radioactive substance to become disintegrated.

Our estimate is about 1-1.5 billion years so repeating that about 4 times we get around 4-6 billion years for it to gain 6.25%.  From this it can be concluded that Potassium-40 as since it comes the closest to remaining at 6.25% its original amount after approximately 6 billion years.

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Answer:

the study of tissues, or groups of cells and their surrounding extracellular materials, is called Histology.

Answer:

The structure labeled 2 is tRNA, transfer RNA

Bicarbonate ions present in body performs a variety of functions, in blood it carries carbon dioxide. Its other functions include keeping the balance of acids and bases in the body. It acts as a buffer.

Buffer is a type of solution that resists pH change either by the addition of acid or base.

Bicarbonate is a base, which the body requires to keep a normal acid-base (pH) balance.

This balance prevents the body from having too much acid means maintaining buffer. The lungs and kidneys helps to keep a normal blood pH by removing excess acid.

Thus, the correct option is B.

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A correlation coefficient of -1 means that bone density and muscle mass are perfectly correlated but in opposite ways.

The correlation coefficient, r, is a measure of the strength of the relationship between two variables.

r = 0 means that the two variables in question have no relationship, r = 1 means that the two variables are perfectly correlated in the same way, and r = -1 means that the two variables are perfectly correlated but in opposing ways.

The implication of the -1 correlation coefficient is that bone density increases with decreasing muscle mass and vice versa.

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Answer:

The DNA gets copied equally through a process called mitosis and the copied DNA(chromosomes) are split equally among the daughter cells.

Answer:

Why dont soft parts usually leave fossils?

The hard parts of organisms, such as bones, shells, and teeth have a better chance of becoming fossils than do softer parts. One reason for this is that scavengers generally do not eat these parts. Hard parts also decay more slowly than soft parts, giving more time for them to be buried.

Explanation:

yeah

Answer:

a nitrogenous base, an amino acid, and a pentose sugar

DNA and RNA molecules share several similarities in their structures. Both consist of a nitrogenous base, a phosphate group, and a pentose sugar. However, they differ in their helical structure, with DNA typically being double-stranded and RNA single-stranded. Thus, correct option is (B).

Ribonucleic acid and deoxyribonucleic acid are two chemicals that are crucial for genetics and other biological processes. Both of them contain pentose sugars, phosphate groups, and nitrogenous bases. Adenine (A), cytosine (C), and guanine (G) are the nitrogenous bases in both DNA and RNA; thymine (T) and uracil (U) are also present in both.

Although they both include a phosphate group and a pentose sugar (deoxyribose in DNA and ribose in RNA), the structural configurations of DNA and RNA are different. The two strands of DNA are typically kept together by base pairing to create a double helix. The majority of RNA, on the other hand, is single-stranded. Their functions and cellular processes are different as a result of this structural heterogeneity.

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Answer:

Muscles can also receive messages from the brain when the body temperature decreases. They respond by shivering. Shivering causes the muscles to contract and relax quickly. This process generates heat.

The scientists employed the use of  X-exome sequencing to identify rare gene mutations in the families.

This involves the process of  genes on chromosome X being identified through positional cloning and used ib various studies.

This was used to identify  rare gene mutations in the families in Finland thereby making it the most appropriate choice.

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Answer:

Explanation:

Answer:

Explanation:

1. Producers make their own food, so option C.

2. Consumers eat others cuz they can't make their own food, so option G.

3. Herbivores (like cows) eat producers (like grasses, plants etc.), thus option E.

4. Carnivores (like tigers) eat other consumers (like cows, deers, even baby tigers) so option H.

5. Omivores eat everything (plants or animals) like humans thus option J

6 Decomposers (like fungi) break down dead stuff so option A.

7 Biotic means living things, thus option F

8 Abiotic is non-living things, thus option B.

9 Mutualism means both animals benefit from helping each other out, option D.

10 Parasites (like leech) harm the host and benefit themselves, thus option i

11 Commensalism means one benefits but the other one is not benefit or harmed, option S

12  P

13 L

14 R

15 N

16 T

17 M

18 Q

19 K

20 O

Not 100% sure on 12, 18-20 but everything else should be right.

Answer: Meiosis

Explanation:

Meiosis creates gamete "daughter cells" that have half the chromosomes as a normal cell that would be created during mitosis, which is the division and reproduction of identical cells from the parent. In humans, a regular 46 chromosome cell divides through meiosis to create gametes with 23 chromosomes. This is important to be sure that an organism that is made through reproduction with sperm and egg has the correct number of chromosomes.

Answer:

Kinetic Energy

Explanation:

An arrow that is being pulled back is building Kinetic Energy.

When the number of predators increase in an area, the immediate effect will be a decrease in number of prey.

A predator in an environment is an animal that kills other smaller animals in its niche for food.

The prey us the smaller animal that is being killed. Therefore when there is increase in the number of predators in an environment, the prey will decreases.

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Answer:

A hair follicle anchors each hair into the skin. The hair bulb forms the base of the hair follicle. In the hair bulb, living cells divide and grow to build the hair shaft. Blood vessels nourish the cells in the hair bulb, and deliver hormones that modify hair growth and structure at different times of life.

Explanation:

Answer:

bees, birds, butterflies, bats, but mostly bees.

Explanation:

Answer:

Bees are essential for the growth of flowers and plants. They use the process of pollination where they transfer small grains of pollen from one flower of the same plant to another flower of the same species. This pollen transfer helps the flowers to get continuous growth.

Explanation:

Answer:

In the nature, plants reproduce s*exually but unlike many organisms, they do not directly mate with their opposite gender  for reproduction. Their mechanism of reproduction in short is that male flowers produce pollens (yellow, powdery type thing) in thei anthers (male fower gamet) and when these pollens get contact with the female flower's stigma, the pollen fuses with the ovule and produces a fruit containing the seed.

Now how do we get these pollens moving from anthers to stigma? There are two ways. The first is by wind, when wind blows, it carries the lightweight pollens through the air and it falls onto a female flower.

the second one is by bees.

Those flowers produce nectar deep in the flower which can be sensed by bees. Bees enter the flower to collect the nectar while pollens are stuck on to its body. The bees travel to another flower for collecting nectar and when they do, the pollens from the body enter the stigma.

Answer:

letter B is the answer

Explanation:

down yes letter b