The variable, or factor, is what is being deliberately changed in the experimental group.

What is the mrna strand that would be copied from this dna strand

Secondary pollutants are more harmful than primary pollutants. select the best answer from the choices provided ot of

Ascientist separates a population of mice into two groups. what would most likely increase the rate of speciation in this population. a. teach the two groups different tricks b. allow the two groups to breed with each other c. put the two groups in different environment d. have the two groups live in identical ecosystems