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:

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

Answer: to locate prey

Answer the following question given this paragraph: The atmosphere has layers. The layers correspond with how temperature changes with altitude. By understanding the way temperature changes with altitude, we can learn a lot about how the atmosphere works. Q: The layers of the atmosphere correspond with what changes with altitude? A:

OPTIONS:
- friction
- nitrogen
- oxygen
- temperature

Answer: temperature

Answer the following question given this paragraph: An ecosystem consists of all the biotic and abiotic factors in an area and their interactions. A niche refers to the role of a species in its ecosystem. A habitat is the physical environment in which a species lives and to which it is adapted. Two different species cannot occupy the same niche in the same place for very long. Q: What do you call the physical environment in which a species lives and to which it is adapted? A:

OPTIONS:
- domain
- environment
- ecosystem
- habitat

Answer: habitat

Answer the following question given this paragraph: The energy of the sun is first captured by producers ( Figure below ), organisms that can make their own food. Many producers make their own food through the process of photosynthesis . The "food" the producers make is the sugar, glucose . Producers make food for the rest of the ecosystem. As energy is not recycled, energy must consistently be captured by producers. This energy is then passed on to the organisms that eat the producers, and then to the organisms that eat those organisms, and so on. Q: What is type of sugar is produced through photosynthesis? A:

OPTIONS:
- carbohydrates
- insulin
- glutamate
- glucose

Answer:
glucose