Which statement best describes the process of evolution? a. Populations can survive in different locations on earth
b. Environmental conditions limit the number of species on Earth d. The traits of a species can change over time
c. Populations grow when resources are abundant
d. The traits of a species can change over time

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

The small molecule cyclic amp (camp) takes about 0.2 second to diffuse 10 μm, on average, in a cell. suppose that camp is produced near the plasma membrane on one end of the cell; how long will it take for this camp to diffuse through the cytosol and reach the opposite end of a very large cell, on average? assume that the cell is 200 μm in diameter.

Veronica and her little sister, monique, are playing on a seesaw. if veronica weighs 75 pounds, and monique weighs 60 pounds, which statement is true?