What are restriction enzymes used for in nature?

We want most cells to be even in and out which is called

Are the earth's ocean floor and continents the same age geologically? why or why not?

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 .