If someone can help think of a model idea i can use.
Please it would help a lot.
-Develop a model to describe the cycling of matter and flow of energy among living and nonliving parts of an ecosystem. You should use multiple parts of the carbon cycle to demonstrate this cycle.

I don’t either, math is not my strong suit

Explanation:

idk what the answer is sorry

I would say the answer is D because just like in example, chicken pox is not always safe, and healthy kids in chicken pox party can also get infected and become very sick instead of just getting exposed to them. Vaccine however just basically gave us immunity to the disease without the getting sick step.