Answer:
Pairs of organs that remove waste from the blood are the kidneys
Answer:
To other people, abstinence means not having sexual intercourse during the time of the month that they may be most fertile. The best description of this practice is periodic abstinence, which is considered a method of natural family planning.
Explanation:
So its acquired immunity and the cells responsible are the B lymphocytes that produces antibodies against the virus. Memory is keep since first encounter of the virus by the immune system by way of the antibodies that was initially produced. The antibodies are there already, which makes it fast to act upon when expose again.
