In performing an immunological procedure, you add 2 ml of serum to 18 ml of saline. two 1: 2 serial dilutions are then made. what is the dilution of serum contained in the final tube?

How many major plates cover the earth

Which of the following is the best definition for the process of photosynthesis? a.) plants digest sugars to make energy. b.) plants use oxygen and glucose to make carbon dioxide. c.) plants use sunlight and carbon dioxide to make sugars. d.) plants use sunlight to make chlorophyll and chloroplasts.

Which factor affects the force of gravity between objects? check all that apply. direction distance mass shape time