What is it called when the number of people suddenly gets smaller?
Options:
- (A) competing for resources
- (B) competition
- (C) A Greek letter
- (D) heat or cold
- (E) Earth orbiting the Sun
- (F) permineralization
- (G) bottleneck effect
- (H) relocation
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Let's think first: Bottleneck effect occurs when a population suddenly gets much smaller. Population is the number of people. Bottleneck effect occurs when the number of people suddenly gets much smaller.... So the answer is [(G)]
Energy that comes from body heat can help with 
Options:
- (A) recovery
- (B) commuting
- (C) movement
- (D) cooling
- (E) strength
- (F) stay warm
- (G) health
- (H) motion
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Let's think first: Evaporation of sweat uses energy, and the energy comes from body heat. When sweat is evaporated into the air, it provides additional cooling. Cooling uses energy, and the energy comes from body heat.... So the answer is [(D)]
The tobacco mosaic virus cannot _ by itself.
Options:
- (A) migrate
- (B) reproduce
- (C) move
- (D) consume
- (E) It expands
- (F) animals
- (G) survive
- (H) respirate
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Let's think first: Viruses cannot reproduce by themselves. Viruses include the Tobacco Mosaic Virus. The Tobacco Mosaic Virus cannot reproduce by itself.... So the answer is [(B)]
Cells do not include
Options:
- (A) harmful substances
- (B) sulfate particles
- (C) the smallest agent of disease
- (D) direct damage to the lungs
- (E) sub-units of species
- (F) Inches or fractions of inches.
- (G) Something with a head, thorax, and abdomen
- (H) Direct sunlight.
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Let's think first: Viruses are not cells. Viruses Viruses are the smallest agents of disease. The smallest agents of disease are not cells.... So the answer is [(C)]
In their quest for reproduction, salamanders are assisted by their what?
Options:
- (A) animals
- (B) kinetic energy
- (C) sense of irony
- (D) taste in clothing
- (E) fur and fat
- (F) sense of smell
- (G) chameleon
- (H) insects
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Let's think first: Most salamanders use their sense of smell to find a mate. Food to survive, mates to reproduce, and water to drink. To reproduce, salamanders are assisted by their sense of smell.... So the answer is [(F)]
What infects and destroys helper t cells?
Options:
- (A) swea
- (B) Wasps
- (C) AIDS
- (D) CO 2
- (E) PDAs
- (F) humans
- (G) heat
- (H) anemia
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Let's think first: HIV infects and destroys helper T cells. Scientists agree that HIV causes Aids. AIDS infects and destroys helper T cells.... So the answer is [(C)]