What do you think Buzz is describing, “species to population to community to ecosystem to biome to biosphere”?

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).

What are examples of the plant life and animal life that can be found in each type of terrarium

How are fossils used to date organisms?