Atoms of which two elements could combine with atoms of carbon (C) to form covalent bonds?
A. K
B. N
O C. Na
I D. Ca
D E. S

S and N because only nonmetals can form covalent bonds

c. movement because i took the test and it lets me review my answers

during the process of dna replication, brdu can replace thymidine and incorporate into the newly synthesized dna, cell proliferation thus can be reflected in the extent of brdu incorporation.