Which cells form the stomata?
a. sieve cells
b. guard cells
c. phloem cells
d. mesophyll cells

Which equation is used to calculate the magnetic force on a charge moving in a magnetic field

Which element forms the basis of all organic organisms a carbon b oxygen c hydrogen d nitrogen

What does the hardy-weinberg principle relate to? a. chances of survival of an organism b. frequency of alleles in a population c. natural selection in a species d. causes of evolution among organisms