Which is not a part of the immune system?
a. skin
b. stomach acid
c. mucus
d. fingernails

Have a friend or family member complete the questionnaire. make a prediction about that person’s wellness and justify your prediction using two or more complete sentences.

Send sperm live for about 48 hours after ejaculation and ovum for only 24 hours after ovulation intercourse can occur after ovulation for fertilization to occur

Which is not an effect of aging? secondary sex characteristics appear bones shrink and become more brittle skin becomes drier and less elastic hearing and vision become less sharp