A. Moisten and filters incoming air
Answer:
I think option B is right answer
The answer is hydrogen bond between the complementary strands.
B - They both use protein channels (I think so at least) they differ because active transports use a pump to leave the cell and it uses atp (cell energy).
The body structure ( ovaries, testes, and external genitalia) that make sexual reproduction possible. Secondary spermatocytes
