Answer:
C .they take up the usable forms of nitrogen found in the soil .
Explanation:
Only once because the DNA replication initiation is tightly linked to cell cycle progression,ensuring that replication occur only once per cycle
3 examples of proteins in living organisms:
1. Collagen - maintains firmness and structure to body cells and tissues, keeping them together.
2. Keratin - creates the protective barrier for living organisms like skin, nails, and hair.
3. Globular and trans-membrane - supports the regulation of the flow of small ions and molecules such as sodium and glucose.
D because they help in photosynthesis to make food for plant
No, we breathe in oxygen and breathe out carbon dioxide so the air could not be a thing with out the mixture of the two
