SAT Biology Subject Test Practice Questions

Answer: D, Community. The interstate has separated the bison into two distinct communities where they share separate niches.

Key Takeaway: Since the two populations are separated by a physical boundary, they now exist in two separate communities where they have two separate niches. Since the general region has not changed, the animals still share the same biome. No changes have taken place to indicate that the animals now share different phyla (plural of phylum) or species.

Photo: Bison, Stefan Didam