When dissecting an animal is it better to start at the top of the chest or bottom? or does it depend on the animal?

Ineed the definitions of all of these words nasap i will give 1o points to whoever awnsers

Flock x flock y flock z total pieces of food eaten (from previous page) 147 93 60 food percentage* % % % simulated number of birds in flock for 3rd generation** * divide each flock's total pieces of food by 300, the total number of pieces of food eaten. ** multiply the food percentage for each flock by the total number of birds (30).

Plz ! ive been stuck on this forever