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Monica [59]
3 years ago
6

The first organisms on Earth were able to transform the carbon dioxide in the air into what essential element needed for modern

life?
A. Hydrogen

B. Helium

C. Nitrogen

D. Oxygen
Biology
2 answers:
SCORPION-xisa [38]3 years ago
8 0
D.) Oxygen, most mammals need good ol' Oxygen in order to turn glucose into energy. 
Len [333]3 years ago
4 0
D. Oxygen  
We wouldn't be here without it
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Pollen and Ovules are gametes. How many chromosomes would they have compared to the rest of the plant's body cells? What process
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Answer:

a. They would have half chromosomes as much as the plants body cells.

b. Meiosis

Explanation:

Gametes are sex cells produced only in sexually reproducing organisms. In plants as stated in this question, male gametes are contained in pollens while female gametes are contained in ovules. The process by which these gametes are made is called MEIOSIS.

Meiosis is a cell division that reduces the chromosomal number of the parent cell by half. This means that each GAMETE will contain half the number of chromosomes as the parent cell. Fir example, if the body cell of a plant contains 30 chromosomes, each gamete formed via Meiosis in that plant will have 15 chromosomes.

In a nutshell, pollen and ovules, which are gametes of plants formed by MEIOSIS would have half chromosomes as much as the plants body cells.

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