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Answer:

microbes that left signs of their presence in rocks that are about 3.7 billion years old.

Explanation:

Answer:

After things cooled down, simple organic molecules began to form under the blanket of hydrogen. Those molecules, some scientists think, eventually linked up to form RNA, a molecular player long credited as essential for life's dawn. In short, the stage for life's emergence was set almost as soon as our planet was born

Answer:

not work

Explanation:

Some things in the water cycle relie on the sun to produce things like flowers and the water can't do some stuff all on its own, just like some animal relie on the sun.

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ehh I hope -_-

Answer:

earthworm

Explanation:

Simply earthworm are found in under the grass

earthworm helps in making soil fertilize

Answer:

Mitosis

Explanation:

When Mitosis is not regulated then cell division is not regulated.

Answer:

The small fish populus will decrease because they need the lilypads to hid them from the big fish.

Explanation:

Answer:

d

Explanation:

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In the DNA isolation process, detergent was used to:

 --> facilitates homogenization. it allows the precipitate to form and stabilizes the DNA and it binds the negative ends of DNA.

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Answer:

B. connective tissue

Explanation:

they act as a sorta framework for the organs, protecting them from moving around too much and also separates them from one another

Degeneration of the corpus luteum results in a drop in progesterone production.

Progesterone is a hormone produced by the corpus luteum that allows the uterus to prepare for fertilization. The halt in production of this hormone then causes the sloughing of the uterus's endometrium, which results in the individual undergoing the process of menstruation.

Therefore, we can confirm that the degeneration of the corpus luteum results in a drop in progesterone production.

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Answer: Plants, animals, and decomposers (which consume dead things) are in a forest ecosystem. Scientists are studying photosynthesis in the forest. Which group or groups of organisms should they study? A jungle ecosystem has plants, animals, and decomposers (which consume dead things).

Explanation:

Answer:

Explanation:

The transformation of a zygote into an embryo adheres both to nature and to nurture: not only genetics but also environment determines the outcome. This idea has assumed many forms. A territory in the early sea urchin blastula contains clones of founder cells, and each clone contributes exclusively to one territory (Cameron & Davidson, 1991). Both the lineage of a founder cell, i.e. its nature, and the position of a founder cell, which determines how it is nurtured, contribute to its fate. Fertilisation, the topic of the first Forum, fixes the genes; interblastomere communication, the topic here, regulates gene expression. Blastomeres communicate like any other cell – via ligand-receptor interactions and through gap junctions. Saxe and DeHaan review these mechanisms. The definition of ligands and receptors becomes broadened in this context, and cell adhesions as well as gap junctions enter into the story. In spite of these entanglements, it appears that nature uses the same sorts of mechanisms to get cells to specialise that she uses to keep them talking. Thus, neurons and glial cells signal to one another via glutamate receptors and gap junctions (Nedergaard, 1994). Likewise, we expect neurotransmitters (and neurotransmitter transporters) to help signal differentiation. The biophysicist may ask whether electrical properties also play a role, but that we reserve for another Forum. If gap junctions figure in development as fusion pores that pass small molecules and electrical signals between blastomeres, another parallel suggests itself. Brian Dale asked in the first Forum: How does a spermatozoon activate an oocyte? This question, which concerns gamete communication, has produced two schools of thought and remains controversial (Shilling et al., 1994). Do sperm activate oocytes via contact-mediated mechanisms or through fusionmediated mechanisms? Or do both mechanisms occur, as they appear to in development?

Most of the time in lichen, ascomycetes or basidiomycetes form the fungal part with several hyphae layers enveloping the photosynthetic algal part.

Lichens are composite organisms. They are formed from a symbiotic relationship between fungi and algae. The fungi provide shelter and some vital minerals for the algae while the algae provide food via photosynthesis.

Oftentimes, the fungi components are usually ascomycetes or basidiomycetes. They form a network of hyphae around the photosynthetic algae as a form of protection.

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Schwann cells participate in the repair of damaged nerves by forming a cellular tube that can direct the growth of new axons.

They are referred to as the myelinating cell of the peripheral nervous system and support cells of peripheral neurons.

They participate in nerve cell repair by the formation of a tube that can direct the growth of new axons.

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Answer:

streptomyces

Explanation:

Answer:

yes it's natural

Explanation:

100% natural to the century we are now so yeah

Chromosomes and linkage groups are 2 fragments of DNA ordered in decreasing size that represent tightly coiled strands of DNA.

Deoxyribonucleic acid (DNA) is the genetic material that all organism uses to transmit hereditary characteristics.

DNA is a double helix molecule composed of two long chains of nucleotides linked via hydrogen bonds.

In eukaryotic cells, DNA is associated with histone proteins, which make it a tightly coiled molecule.

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Answer:

The movement of the plates sometimes leads to earthquakes and tsunamis.

so,the process by which organism maintain a relatively stable internal environment

The statement embryonic stage is the first phase of the prenatal stage, lasting only two weeks after conception is false.

An embryonic stage may be defined as the period after implantation, during which all of the major organs and structures within the growing mammal are formed.

The first two weeks after conception are known as the germinal stage, not the embryonic stage. The third through the eighth week is known as the embryonic period, and the time from the ninth week until birth is known as the fetal period.

Therefore, the statement embryonic stage is the first phase of the prenatal stage, lasting only two weeks after conception is false.

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Answer:

False

Explanation:

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1. Hotter temperatures, causing fires and making it harder to grow crops.

2. Air pollution causes lower air qualities, and makes earth hotter

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.It is possible that Kalani is the father of Marcus but he can not be the father of Kevin.

Genotype has to do with the total number of genes that an offspring recieves from its parents. We are told that the parents here are Kalani (blood type AB) and Winnie (blood type B).

If this is the case, it is impossible to explain the fact that Kevin has blood group O.It is possible that Kalani is the father of Marcus but he can not be the father of Kevin.

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The haploid form of Ulva switches to the diploid form when gametophytes produce cells that undergo mitosis to produce gametes that fuse to form a zygote. Therefore, option D is correct.

The sexual stage in the alternation of plant generations and some algae is called a gametophyte. This stage results in gametes that go through generational alternation. It produces the zygote from which sporophytes develop and is a haploid phase.

The gametophyte stage of life is the predominant one in bryophytes. The male and female gametes are produced by the gametophyte's antheridia and archegonia, respectively. Gametangia are all of these structures put together.

Thus, the haploid form of Ulva switches to the diploid form when gametophytes produce cells that undergo mitosis to produce gametes that fuse to form a zygote. Therefore, option D is correct.

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Your question is incomplete, most probably the full question is this:

How does the haploid form of Ulva "switch" to its diploid form?

A. Sporophytes undergo meiosis to produce spores that germinate into diploid adults.

B. Gametophytes produce cells that undergo meiosis and produce spores that germinate into diploid adults.

C. Sporophytes produce cells that undergo mitosis to produce gametes that fuse to form a zygote.

D. Gametophytes produce cells that undergo mitosis to produce gametes that fuse to form a zygote.

Answer:

Fusion is generally impossible because the strongly repellent electrostatic forces between the positively charged nuclei prevent them from colliding and fusing. One of the key reasons we haven't been able to realize the promise of fusion is because its energy requirements are outrageously large. High-energy neutrons are produced during fusion reactions, although they are not radioactive in and of themselves. They do, however, have such a strong influence on the reactor's walls.

Answer:

The wing of a bird and the arm of a human are examples of c. homologous structures. This is because they are structures which have a similar

Answer: C. Eat a plant-based diet

Explanation: Of the following, the most impactful action you can take to reduce your

carbon footprint is: Eat a plant-based diet

Carbon footprint is the emission of the greenhouse gases like carbon. Lights should be turned off whenever not in use can help in reducing the carbon footprint. Thus, option A is correct.

The carbon footprint is the amount of carbon, methane, and other greenhouse gases emitted due to natural or man-made activities. It is expressed in the terms of carbon dioxide released into the atmosphere.

The lights should be turned off whenever not in use to reduce the emission of the gases that harms the ozone and environment as the light energy release many greenhouse gases.

Therefore, the lights should be turned off whenever not in use to reduce the carbon footprint.

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