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
I like 4 the best. If an organism is covered by sediment before the body decays the sediment can harden around the decaying body and the imprint will be preserved in the hardened sediment.
Answer:
Population can take months. while ecosyistem can be destroyed in one day
Explanation:
The answer is Radiometric Dating. Glad to help.