a drug company is testing the effectivness of a new blood pressure medicine using rats as the test subjects what are the possible factors that must remain constant during the testing

the type of rat, the amount of medicine

sex cells are usually half's then they find another half and make a fertilize egg

in a chemical reaction, the atoms and molecules produced by the reaction are called products. no new atoms are created, and no atoms are destroyed. in a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.