Pls help I asked 3 times and I used all my points!! Which field studies all organisms that have existed, where they came from, and how they are related

An example of what is geese flying south for the

Out of the seven main animal groups (fish, mammals, birds, insects, reptiles, amphibians, and arachnids), how many contain members with internal backbones? a. 5 b. 3 c. 7 d. 1

Achild is suffering from fever but the doctor cannot immediately pinpoint the alignment on the basis of this one symptom explain why also mention other two such general symptoms