Use the drop-down menus to identify the scientists who match the descriptions below.

Which way do the nitrogenous bases in dna pair up? a. a and g; t and c b. a and c; t and g c. a and t; g and c d. a and a; t and t; g and g; c and c

What type of cell division is used to replace old cell?

Si units are the modern form of the