Which statement best illustrates a biotic or an abiotic factor that is often found in a city park?
o decaying leaves are an abiotic factor because they are not living
o rocks are an abiotic factor because they have never been alive.
o water in ponds is a biotic factor, because it provides a habitat for living things.
o oxygen is a biotic factor, because it is required for life and found in all living things.

Rocks are abiotic

Explanation: They arnt alive so how can it be biotic?

the second choice is correct

Explanation:

Decaying leaves are a biotic factor. Rocks, water and oxygen are all nonliving, so they are abiotic factors.

sheep is a herbivore animal whereas grasshopper belongs to the class chordates but both of them feed on greens.  

if grasshopper and sheep feeding on a pasture land, i do not think both of them will have any impact on each other. however, the number of the species can make difference. since sheep feed on greens, there is a possibility there left no pasture land for the grasshoppers or they may get extinct.