Which 2 statements explain how in Earth worms oxygen system helps provide itself with oxygen

i think oxygen from the surrounding is,obtained through the plasma membrane of an earth worm by the process called diffusion

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.

d. groundwater flows through the subsoil and deposits minerals.