What is the main purpose of controlled variables in an experiment?

What is the name of the type of cell division that occurs in the prokaryotic cell cycle

If jane has the blood type ab and marries john who has type o blood what are the possible phenotypes of their first kid?

Select all that apply genes are specific nucleotide sequences occur in numbers that are the same as the number of chromosomes are located in a specific place on a chromosome determine the traits of an organism are units of rna