C is the only bad sounding thing out of this bunch.
Answer:
Stomach acid kills bacteria and parasites that have been swallowed. Your urine flow flushes out pathogens from the bladder area. Skin, tears and mucus are part of the first line of defence in fighting infection. They help to protect us against invading pathogens
Explanation:
Population would be the answer
The DNA can become a double strand again.
Ur answer is A. G2
Explanation: it goes G1 Phase, S Phase, and then G2 phase. The answer is A.