Housing development is situated near a river that flows into a bay. Which of the following is an abiotic factor in the river that would directly affect the marine
ecosystem in the bay?
The types of trees growing along the river bank
The types of sediment moving down river
The amount of houses facing the river
The amount of plant life in the river

Types of sediment

Explanation:

This is a process of elimination question. First trees are living so they are biotic. Houses facing the river wont affect it at all, and plant life is also biotic leaving sediment.

a "theory" a suggestion that is not 100 % accurate, or a figure. some people say its a theory because they of all the passed theory's about one subject. it depends sometimes theory might be accurate and sometimes they are.