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matrenka [14]
3 years ago
15

Describe the role of a nebula in the life cycle of a star. Please use your own words​

Biology
1 answer:
raketka [301]3 years ago
6 0

Answer:Stars are formed in clouds of gas and dust, known as nebulae. Nuclear reactions at the centre (or core) of stars provides enough energy to make them shine brightly for many years. The exact lifetime of a star depends very much on its size.

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Colored aleurone in the kernels of corn is due to the dominant allele R. The recessive allele r, when homozygous, produces color
abruzzese [7]

Answer: C. It was heterozygous for both genes.

Explanation: To produce a generation that has individuals with trait for colored aleurone in the kernels, the plant being analised has to have a dominant allele R. In the same way, to have offspring with the recessive trait, it has to carry the recessive allele r. So, the unknown plant has to be heterozygous for colored aleurone in the kernels, Rr.

The same thought can be applied to plant color: Since there are green and yellow plants, the unknown plant has to be heterozygous for that trait, Yy.

In conclusion, the unknown plant is heterozygous for both genes.

4 0
3 years ago
Select the correct location on the image. Keiko’s teacher was discussing the theory of endosymbiosis. She asked Keiko to mark th
const2013 [10]

Mitochondria in animal cells, while mitochondria and chloroplast in plant cells most closely resembled prokaryotes.

<h3>What do you mean by endosymbiotic theory?</h3>

This theory states that organelles such as mitochondria and chloroplast in eukaryotic cells were once prokaryotic microbes.

These organelles when occupied in prokaryotes divide by binary fission. But they become a part of the eukaryotic cell now and result in a symbiosis relationship between each other.

Therefore, Mitochondria in animal cells, while mitochondria and chloroplast in plant cells most closely resembled prokaryotes.

To learn more about Endosymbiotic theory, refer to the link:

brainly.com/question/1698852

6 0
2 years ago
For what reasons could a theory be changed or replaced? Check all that apply.
julsineya [31]

1. New technology is developed that provides more information about the theory.

2. New experimental methods are designed to test a theory.

3. A single experiment produces results that differ from all previous experiments.

im not sure about #3 but it could be it

7 0
3 years ago
*Sigh* I probably won't get an answer for this, but whatever. What are cells that express the same genes?
il63 [147K]
<span> A cell typically expresses only a fraction of its genes and the different types of cells in multi cellular organisms rise bc of its different set of genes are ex-pressed
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5 0
3 years ago
1. How did Hubble determine that the Universe is expanding?
inna [77]

Answer:

.

Explanation:

5 0
3 years ago
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