A scientist places four identical cells into four different liquids, each with different concentrations of magnesium. Which shows evidence of active transport?

cells W and Z
cell W only
cell Y only
cells X and Y

Environmental impacts on evolution : mastery test

Acertain species of fish can have either long or short fins. the allele for long fins is dominant over the allele for short fins. a heterozygous, long-finned fish is crossed with a homozygous, short-finned fish. of the offspring, will have long fins and be , and will have short fins and be .

What is true of sea slugs in these orders