How many dogs are killed each year in pounds

So you and your partner don’t get sexually transmitted diseases and so your partner doesn’t get pregnant

Ican only answer your first question, a machine is like a human body because it's a little similar. they both almost work like the same.

(a) is not correct because one does not get increased cholesterol  from lifting weights.(b) is not correct because lifting weights cannot reduce the risk of a hereditary disease.(c) is not correct because back pain isn't a benefit! and plus, if he lifts weights properly, he should not have back pain.(d) is the correct answer because his ligaments will gain mass, making it easier for him to carry heavier weights and he will also be stronger!