What regulate movement of substances through a cell's membrane?
a. glucose molecules
b. protein molecules
c. starch molecules

The model illustrates a process by which a substance is taken up by a cell

In pea plants, the allele for inflated pod seed, i, is dominant over the allele for constricted pod seed, i. the punnett square shows a cross for this trait. which offspring will be homozygous dominant

In the water cycle , when does water undergo a chemical change