2................................................
Answer:
nucleus
Explanation:
eukaryotic has a nucleus, prokaryotic does not
The answer is A or the first one
Answer: A.) The nitrogen cycle recycles nitrogen through an ecosystem, making it available to all organisms.
Explanation: Nitrogen is an essential nutrient for plants and a significant component of proteins, which all animals need to grow, reproduce and survive. The nitrogen cycle converts nitrogen into compounds that plants and animals can use.