Ap Biology Multiple Choice problem?Plzz help?

Question

Suppose that the number of birds species is determined mainly by the number of verticle strata found in the environment. If so, in which of the following bioms would you find the greatest number of bird species???

A. Tropical rain forest

B. savanna

C. Desert

D. temperature broadleaf forest

E. Temperture grassland

Thx and 10 easy points

Answer 1

A. Tropical rain forest.  

Answer 2

A.  Strata=layers.