The answer would be 20 amino acids found in living organisms
2. The endosymbiotic theory suggests that a eukaryotic cell is the result of one prokaryotic cell eating another.
Answer:
Iron from the sand.
Explanation:
Since some types of ocean life, (plankton, algae, etc.) do sometimes not get enough iron, (nutrient) in their bodies, sand is needed for their survival. Sand has lots of iron for the animals' health, so sand is vital for their health and survival.
Answer: Endrocrine would be the correct answer. Hope this helped!
