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Diano4ka-milaya [45]
2 years ago
8

Which compound was abundant in Precambrian Earth’s oceans, before complex life evolved on Earth?

Biology
2 answers:
Ganezh [65]2 years ago
7 0
The Precambrian time refers to the time 4.5 billion to 542 millions year ago. This period is characterized by having reduced atmosphere and included reduced compounds. Scientists believed that atmosphere at that time was devoid of free oxygen and CO2 was present in excess. Before the complex life evolved on the Earth, the Precambrian Earth's ocean contained dissolved carbon dioxide.
Ksivusya [100]2 years ago
6 0

dissolved carbon dioxide

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Answer:

Because natural selection selects for it. Thus it persists.

Explanation:

You have to understand heterozygote advantage. Basically, it's where heterozygotes have an advantage over homozygotes. In the case of sickle cell disease, heterozygotes have an advantage, and natural selection favors whatever is advantageous. Thus, because heterozygotes each have one recessive sickle-cell allele, as natural selection favors the heterozygotes, the recessive sickle-cell allele persists and remains in the gene pool.

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Which of the following requires eIFs for initiation? Which of the following requires eIFs for initiation? eukaryotic translation
andre [41]

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Eukaryotic translation.

Explanation:

Translation is the process of the formation of the proteins from the RNA molecules with the help of different enzymes and proteins. Translation is quite different in case of prokaryotes and eukaryotes.

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Thus, the correct answer is option (1).

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Answer: Correct options are A, C and D

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