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Wittaler [7]
2 years ago
14

Local farmers think that a commonly used pesticide is responsible for the increase in appearance of frogs with an additional app

endage. To test this hypothesis, frogs are injected with a small amount of pesticide mixed in ethanol. The frogs are allowed to produce offspring to test the effect of the pesticide. Which of the following would be the best controlled experiment? A. One group is injected with ethanol, and one group is injected with pesticide. B. One group is injected with pesticide. C. One group is injected with pesticide, and one group is not injected with anything. D. One group is injected with ethanol, one group is injected with pesticide, and one group is not injected with anything.
Biology
1 answer:
stira [4]2 years ago
4 0

Answer:

D.-

Explanation:

A control group is needed to carry out the experiment, that control group is the one that is not injected with anything.  Ethanol and pesticide need to be injected into separated groups to document whether it is one or the other that is harmful

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a town has authorized the construction of a large sports complex at the top of a hill that is covered by a forest. How may the r
Tomtit [17]

If the forest on the hill is cleared, than the soil will lose its natural cover and protection from erosion. The soil will become much more exposed to the erosion, and its top layers will be moved away relatively easy and quickly. Those layers will move downwards, and practically will end up into the river that passes beside the hill. With a significant increase of sediments getting into the river, the river will start to deposit much more material. Also, the sediments will make a problem when there's heavy rainfall because the river will be able to get out of its river bad more easily and cause a flood. The water of the river will also became murkier, muddier, which will make it dark yellowish/light brownish in appearance when there will be rainfall.

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2 years ago
When water dissolves a substance, weak charges on water molecules attract oppositely charged portions of the substance, pulling
guapka [62]

Answer:

C) polarity

Explanation:

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Nadusha1986 [10]

Answer;

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