Question

what level of organization refers to all the biotic and abiotic factors in an area?
a ecosystem
b biome
c population
d community

Explanation:

An ecosystem includes all biotic (living) and abiotic (non - living) factors in an area. A biome is a large region with distinct climate and characteristic plant and animal communities. A population is a group of the same species in an area. A community is all the different species in an area, but it doesn't include abiotic factors.

Answer:

A. ecosystem