Problem:OPTIONS:
- skin
- membrane
- nerves
- immunity

Answer the following question given this paragraph: Immunity can be acquired in an active or passive way, and it can be natural or artificial. Watch this video (http://openstaxcollege. org/l/immunity) to see an animated discussion of passive and active immunity. What is an example of natural immunity acquired passively?. Q: What bodily defense can be acquired in an active or passive way, and can be natural or artificial? A:
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A: immunity

Problem:OPTIONS:
- to locate mates
- to sleep
- to reproduce
- to locate prey

Answer the following question given this paragraph: Fish also have a centralized nervous system with a brain. Fish brains are small compared with the brains of other vertebrates, but they are large and complex compared with the brains of invertebrates. Fish also have highly developed sense organs that allow them to see, hear, feel, smell, and taste. Sharks and some other fish can even sense the very low levels of electricity emitted by other animals. This helps them locate prey. Q: Why do sharks sense low levels of electricity? A:
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A: to locate prey

Problem:OPTIONS:
- lithosphere
- stratosphere
- ionosphere
- thermosphere

Answer the following question given this paragraph: The thermosphere is the layer above the mesosphere. Temperature increases with altitude in this layer. The northern and southern lights occur here. Q: In which sphere of the atmosphere do the northern and southern lights occur? A:
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A: thermosphere

Problem:OPTIONS:
- carbon
- white blood cells
- platelets
- oxygen

Answer the following question given this paragraph: The blood picks up oxygen in the lungs and carries it to cells throughout the body. Q: What does blood pickup from the lungs to be carried throughout the rest of the body? A:
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A:
oxygen