What is the difference between a biome and an ecosystem? A
Biomes are large areas that may include several ecosystems.

B
Ecosystems are large areas that may include several biomes.

C
Biomes only contain biotic factors while ecosystems contain abiotic factors.

D
Ecosystems only contain biotic factors while biomes contain abiotic factors.

A

Explanation:

Biomes are a large area (example: tundra, forest, arctic) that can hold ecosystems, ecosystems are biological communities of interacting organisms and their physical environment.

the answer is true when observing or determining population size, a direct observation is use, in which each organism is counted in a population or in an area. one benefit of this measure is that you get the exact population count but it will take a long time to  determine  the  size  of a  population.