Answer:
A.All the above are functions of the CNS.
Explanation:
They are all systems of CNS, therefore A is the answer.
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Artificial methods in common use include preventing the sperm from reaching the ovum (using condoms, diaphragms, etc), inhibiting ovulation (using oral contraceptive pills), preventing implantation (using intrauterine devices), killing the sperm (using spermicides)
I think the answer is B. physical activity during pregnancy may increase the likelihood of postpartum depression
D. The percentage of muscle and body fat is often defined as the mass of the body which is why this is taken into account when measuring the BMI for children and teens. It might not use all of the fat, but some parts of it is needed to measure the mass effectively.
C. Connecting with others
All the other choices would be detrimental.