A tropical rainforest typically has _ layers.
a ) 2
b ) 3
c ) 4
d ) 5

I’m doing some practice exam questions for biology, and i’m not sure how to do these 3 parts to the question.

Examine the two squirrel populations in the accompanying figure. the populations are separated by a geographic barrier. if after a long period of time the two species are no longer separated, what evidence is needed to determine if speciation has occurred? the figure shows two populations of squirrels separated by a geographic barrier. examine the two squirrel populations in the accompanying figure. the populations are separated by a geographic barrier. if after a long period of time the two species are no longer separated, what evidence is needed to determine if speciation has occurred? the figure shows two populations of squirrels separated by a geographic barrier. polyploidy is creating new species. the two populations are not interbreeding freely. hybrid offspring of the two populations begin to appear. one species will increase into a population size twice as large as the other species.

Brainliest ! which would require more force to move or slow down between a bowling ball and a soccer ball? explain why?