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1What role does a(n) grass play in its ecosystem?
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Answer: producer
A(n) grass is a producer because it makes its own food through photosynthesis using sunlight.
2Repeated weather conditions in a region measured over a long period of time. What term best describes this?
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Answer: climate
Climate is correct. Climate is the pattern of weather a place has over many years — the temperatures and rainfall it usually gets, not what is happening right now. Weather is one day's conditions; climate is the long-run pattern those days add up to.
3What do many seeds need to travel away from the parent plant?
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Answer: wind, water, or animals
Seed dispersal helps plants spread.
4A student observes a(n) hawk in an ecosystem. Which statement explains why it is classified as a secondary/tertiary consumer (carnivore)?
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Answer: it hunts and eats other animals
A(n) hawk is a secondary/tertiary consumer (carnivore) because it hunts and eats other animals.
5A moving car's headlights is an example of which energy transformation?
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Answer: electrical energy changes into light energy
In this scenario, electrical energy changes into light energy.
6Which statement below is accurate?
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Answer: In the food web grass → grasshopper → frog → snake → hawk, the grass is the producer.
The accurate statement is: "In the food web grass → grasshopper → frog → snake → hawk, the grass is the producer." The remaining statements each contain an inaccuracy.
7Which direction does the north pole of a magnet point when it hangs freely?
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Answer: toward Earth's north
It aligns with Earth's field.
8Which statement below is accurate?
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Answer: A bat's large ears help the bat detect echoes for echolocation while hunting at night.
The accurate statement is: "A bat's large ears help the bat detect echoes for echolocation while hunting at night." The remaining statements each contain an inaccuracy.
9Why should only one variable be changed at a time in an experiment?
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Answer: so you can tell what caused the result
One change at a time keeps the test fair.
10A puppy from the same litter may have a different coat pattern than its sibling. This is best explained by which concept?
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Answer: individual variation within a species
This scenario illustrates individual variation within a species.