Which statement about the cell membrane is true?
a. it contains cellulose and sugars that are involves i'm communication.
b. it us present in animals cells only.
c. it is rigid and elastic fur supporting the cell's shape.
d. it prevents harmful substances from entering a cell.

The energy needs of a human population are not affected by

Asmall number of finches are removed randomly from the wild and placed in a protected bird area. they are given as much food as they need and have plenty of space. why would natural selection not occur in this population? a. there is no reason for genetic mutation to occur. b. the birds compete for limited resources, c. the population has not reached carrying capacity. d. there is no genetic variation in the finches.

How does this experiment explain why it is often milder in areas such as coastal maryland while areas such as kansas or iowa have more extremes in temperature