Which chemical controls sexual development and reproduction in females?
Options:
- (A) acetic acid
- (B) Hemoglobin
- (C) Fructose
- (D) barnacles
- (E) animals
- (F) Estrogen
- (G) Pesticides
- (H) Baby spray
--
Let's think first: Sex hormones are chemical messengers that control sexual development and reproduction. Estrogens are female sex hormones. Estrogen controls sexual development and reproduction in females.... So the answer is [(F)]

What may become unbalanced if the rate of breathing is too fast or too slow?
Options:
- (A) meiosis
- (B) rain levels
- (C) photosynthesis
- (D) blood acidity
- (E) an organism's body
- (F) Veins and arteries.
- (G) kinetic energy
- (H) swamp vegetation
--
Let's think first: Blood pH may become unbalanced if the rate of breathing is too fast or too slow. Acidity is measured with a pH meter or with pH paper strips. Blood acidity may become unbalanced if the rate of breathing is too fast or too slow.... So the answer is [(D)]

What is the process by which organisms give rise to their young?
Options:
- (A) Summer
- (B) cell division
- (C) autumn
- (D) Plants growth
- (E) peachleaf willow
- (F) ejaculation
- (G) reproduction
- (H) mating rituals
--
Let's think first: Reproduction is the process by which organisms give rise to offspring. Fetus is Latin for offspring or young one. Reproduction is the process by which organisms give rise to their young.... So the answer is [(G)]