What instruments is best used for observing a single-celled organism like the one seen here?

What type of limiting factor affects a large population more then it affects a small population

Although there are a limited number of amino acids many different types of proteins exist because..

What happens during interphase? (1)the nucleus grows to its full size. (2)the cell grows to its full size. (3)the nucleus divides into two nuclei. (4)the cell divides into two cells.