A well designed experiment does not contain the following. random assignment to study groups non-random assignment to study groups manipulate the independent variable Help me please l I need your help please

trachea, alveoli, lung capillaries, arteries

burning fossil fouls really decrease the carbon in the atmosphere so b

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.

it's d - life cycles - apex