During cell division a chromosome is made of two distinct strands called A. centromeres
B. homologs
C. chromatids
D. daughter cells

How many variables are altered in a good experiment? a.1 b.0 c.2 d.3

How can you keep track of variables in a science experiment?

Fill in the blank with the best word to complete the sentence. white blood cells protect against and aid in blood clotting when injuries are sustained.