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
By their activity in the soul
The answers please? i know that mudslides would be a big issue because the roots are no longer there to help hold the soil i hope this helps :)
B. law of conservation of mass
This is why the total amount of and element before and after a chemical reaction is constant.