Why do food chains in an ecosystem rarely contain more than five organisms?
a. nutrients are recycled by the decomposers back to the producers.
b. nutrients are lost from the ecosystem when organisms die.
c. the conversion of food into growth by an organism is not very efficient.
d. energy is recycled by the decomposers back to the producers.

The answer should be D because if thats one of your answers on your tests and you missed it, then i would recemend studing. D is the answer because if organisms die, then new ones grow.

Well as you move along a food chain, energy is lost due to excrement, growth, respiration, etc. So having a really long food chain would mean very few nutrients from the original plant would actually make it to the apex predator. From that knowledge, C looks like the answer. Nutrients definitely aren't lost from an ecosystem, and I don't see how recycling nutrients or energy would be a limiting factor on the length of a food chain, since it can happen at any point on it

I’m not exactly sure what your trying to ask, but if it’s how an organelle is similar to a body system or a part a nucleus is like a in function. but i don’t fully understand what you’re trying to ask