What often precedes mating?
Options:
- (A) A Greek letter
- (B) competition
- (C) friendship
- (D) birth of a child
- (E) death
- (F) Chemical energy
- (G) pregnancy
- (H) sweating
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Let's think first: Mating is generally preceded by courtship. Friendship usually precedes courtship, and courtship, marriage. Friendship often comes before mating.... So the answer is [(C)]

Where does the energy to evaporate perspiration come from?
Options:
- (A) heat produced
- (B) The Sun
- (C) goosebumps
- (D) electrical energy
- (E) kinetic force
- (F) body heat
- (G) heat energy
- (H) energy
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Let's think first: Evaporation of sweat uses energy, and the energy comes from body heat. Sweat glands pump perspiration through pores. Perspiration comes through pores and is evaporated by energy from body heat.... So the answer is [(F)]

What part of a tree would be woody and covered in bark?
Options:
- (A) shrub beds
- (B) the leaves
- (C) the roots
- (D) cacti
- (E) a sapling
- (F) Chlorophyll
- (G) the trunk
- (H) four limbs
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Let's think first: Trees have woody stems covered with bark. Stems of plants include trunks and branches. Trees have woody trunks covered with bark.... So the answer is [(G)]

The most advantageous type of reproduction can be chosen when generational what is used?
Options:
- (A) Plants growth
- (B) alternation
- (C) competition
- (D) Chemical energy
- (E) A computer
- (F) colors
- (G) Energy.
- (H) Energy
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Let's think first: Alternation of generations allows for both asexual and sexual reproduction. Advantages and disadvantages of sexual as opposed to asexual means of reproduction. Alternation of generations allows for using the most advantageous type of reproduction.... So the answer is [(B)]

When an animal or plant group gets much smaller, that's called a:
Options:
- (A) bottleneck
- (B) Winter
- (C) Movement
- (D) population explosion
- (E) genus
- (F) relocation
- (G) Mason jar effect
- (H) choker
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Let's think first: Bottleneck effect occurs when a population suddenly gets much smaller. Animals and plants exist as populations. Bottleneck effect occurs when an animal or plant group gets much smaller.... So the answer is [(A)]

The measurement of what falls from lower to higher altitudes?
Options:
- (A) snow
- (B) rain
- (C) Energy
- (D) heat
- (E) Inches
- (F) meters
- (G) H 2 O
- (H) motion
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Let's think first: Temperature falls from lower to higher altitudes. Heat and temperature are the same. Heat falls from lower to higher altitudes.... So the answer is [(D)]