B - energy flow from one tropic level to the next
I'd say zoology.
Zoology is the study of animals, generally speaking, and since birds are animals, the study of these fall into the field zoology. The study of birds though, is called ornithology.
Hope it helped,
BioTeacher101
Salt molecules are much smaller than sugar molecules, so more of them will dissolve in water.
Hope this helps<3
1) A
2) B
3) B
4) C
5) B
6) C
7) D
8) B
9) A
10) A