Something that is primarily electrostatic in origin causes water to expand when it what?
Options:
- (A) heat
- (B) freezes
- (C) a hazard
- (D) boiling
- (E) moves
- (F) reacts
- (G) expelled
- (H) it's state
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Let's think first: Hydrogen bonds cause water to expand when it freezes. Hydrogen bonds Hydrogen bonds are primarily electrostatic in origin. Something that is primarily electrostatic in origin causes water to expand when it freezes.... So the answer is [(B)]

Saturated fatty acids are used for:
Options:
- (A) exercise
- (B) Reproducing
- (C) solid, liquid, gas
- (D) energy storage
- (E) keeping the dog warm
- (F) oxidation reaction
- (G) an organism's body
- (H) Plants growth
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Let's think first: Animals use saturated fatty acids to store energy. Animals store excess energy as fat. Saturated fatty acids can be used to store excess energy.... So the answer is [(D)]

Fertilization of what would produce a diploid zygote?
Options:
- (A) ovulation cell
- (B) ova
- (C) p53
- (D) eggs
- (E) diploid tissue
- (F) fertilization cell
- (G) corn
- (H) ovum
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Let's think first: Fertilization of gametes produces a diploid zygote. Examples of gametes are ova and spermatozoa. Fertilization of ova produces a diploid zygote.... So the answer is [(B)]

When snow falls to the ground and soaks into the ground, what can it become?
Options:
- (A) steam
- (B) ice
- (C) Sediment
- (D) thermal heat
- (E) dangerous
- (F) flooding
- (G) groundwater
- (H) rainfall
--
Let's think first: Some precipitation that falls on land may soak into the ground, becoming groundwater. Most of the precipitation falls as snow. Some snow that falls on land may soak into the ground becoming groundwater.... So the answer is [(G)]

Mammals generate heat mainly by what?
Options:
- (A) hugging mammals
- (B) calorie counting
- (C) with their fur
- (D) energy of moving objects
- (E) burning calories
- (F) sweating
- (G) selling fur coats
- (H) flow of electrons
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Let's think first: Mammals generate heat mainly by keeping their metabolic rate high. And resting metabolic rate is a big contributor to calories burning. Mammals generate heat mainly by burning calories.... So the answer is [(E)]

What breathes by relaxing the lungs?
Options:
- (A) mammals
- (B) tortoises
- (C) dogs
- (D) chickens
- (E) ducks
- (F) humans
- (G) crocodiles
- (H) animals
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Let's think first: Mammals breathe with the help of a diaphragm. Belly breathing uses the diaphragm, which helps relax the lungs. Mammals breathe by relaxing the lungs.... So the answer is [(A)]