Energy is said to flow in a one way stream through an ecosystem describe what it means

primary succession begins with a bare rock and ends with a forest secondary succession begins after a natural disaster where there is a temporary setback after a forest fire or local destruction, but the surrounding area can fill in

any abiotic or biotic factor in an ecosystem that causes a population's size to slow or decrease is a limiting factor.

the answer is cell division : )

if you know your abc's you should be able to get your answer or just use google