Hello there Jonnromeroo, thank you for asking a question here on Brainly!
You Asked ➤ Which of the following processes begins when a star enters the main sequence?
↴ OUR CHOICES ↴
A: Nuclear fission
B: Nuclear fusion
C: Condensation of a nebula
D: Appearance of a supernova
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Answer ➤ B: Nuclear fusion
Explanation: When a star begins the process of being created, it is hot and dense. Really hot and dense! It begins to start fusing with helium which is the start of its main sequence called nuclear fusion.
I hope this answer is helpful to you, but please let me know if you have any other questions regarding it.
<em>- Qamar </em>
The correct answer to this question is this one: "C. The plant exists as a diploid organism, and at other times as a haploid." Vascular plants exhibit alternation of generation. The alternation of generation is presented as the plant exists as a diploid organism, and at other times as a haploid.<span>
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A feature which distinguishes ribose from deoxyribose is, the absence of an OH at the 2' carbon.
In the ribose the second carbon atom contains hydrogen atom only. Ribose is termed as the carbohydrate.
It is a simple sugar which has linear form H-. It is a monosaccharide which contains five carbon atoms.
Deoxyribose is being derived from DNA and it differs from ribose by having hydrogen atom instead of hydroxyl group which functions as a RNA splicing.
