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?

Metamorphic rocks are formed when sedimentary or igneous rocks are subjected to heat or pressure and recrystallize without melting. which of the following rocks results from the metamorphism of limestone? a. granite b. slate c. sandstone d. marble

Which statement is true about the cell theory? a) it is well-supported by evidence. b) it is unchangeable and permanent.

What are the formed elements (cell or parts of cell) in blood and what are their functions ?