Mutations are what to evolution?
Options:
- (A) Plants growth
- (B) essential
- (C) optional
- (D) competition
- (E) dangerous
- (F) non essential
- (G) voluntary
- (H) allow growth
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Let's think first: Mutations are essential for evolution to occur. When that occurs, several things happen. Mutations are essential for evolution happen.... So the answer is [(B)]

Most carcinogens can cause cancer by causing mutations to what?
Options:
- (A) that material's properties
- (B) dexyribonucleic acid
- (C) Veins and arteries.
- (D) Chlorophyll
- (E) harmful substances
- (F) properties
- (G) a lot of human deaths
- (H) characteristics
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Let's think first: Most carcinogens cause cancer by producing mutations in DNA. DNA DNA is deoxyribonucleic acid. Most carcinogens cause cancer by producing mutations in dexyribonuclein acid.... So the answer is [(B)]

Some precipitation that falls on land soaks into the ground, into:
Options:
- (A) wells and springs
- (B) mountains
- (C) clouds
- (D) it flows to a lower level
- (E) water vapor
- (F) sedimentary rocks
- (G) deltas
- (H) loose dirt
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Let's think first: Some precipitation that falls on land may soak into the ground, becoming groundwater. Wells and springs are supplied by groundwater. Some precipitation that falls on land soaks into the ground, into wells and springs.... So the answer is [(A)]

Objects that are a few nanometers in size can be seen only with:
Options:
- (A) an electron microscope
- (B) refraction of light
- (C) matter vibrating
- (D) ultrasound
- (E) The bending of a ray of light
- (F) slight magnification
- (G) flashlights
- (H) lens
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Let's think first: Viruses are so small that they can be seen only with an electron microscope. Viruses Viruses are very small, a few nanometers in size. Objects that are only a few nanometers in size can be seen only with an electron microscope.... So the answer is [(A)]

What relies on a relatively narrow range of something you can measure with paper strips?
Options:
- (A) Length
- (B) voltage
- (C) all life
- (D) mammals
- (E) humans
- (F) Most plants
- (G) agriculture
- (H) animals
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Let's think first: All life relies on a relatively narrow range of pH, or acidity. Acidity is measured with a pH meter or with pH paper strips. All life relies on a relatively narrow range of something you can measure with paper strips.... So the answer is [(C)]

Most invertebrates have brains capable of what?
Options:
- (A) telepathy
- (B) movement
- (C) telekinesis
- (D) allow growth
- (E) animals
- (F) learning
- (G) relocation
- (H) power
--
Let's think first: Most invertebrates have a more complex nervous system. Cephalopods have well developed nervous systems with complex brains capable of learning. Most invertebrates have brains capable of learning.... So the answer is [(F)]