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tatuchka [14]
3 years ago
11

A researcher conducts a study to determine the effectiveness of a chemical at removing paint from a house’s siding. The research

er’s study shows that the chemical removes around 80 percent of the paint on the test samples. The researcher publishes her results. Several other scientists read about the experiment and repeat it in their own laboratories.
Why should the scientists repeat an experiment that has already been done?

A. The scientists are trying to claim the discovery as their own.
B. Scientists repeat experiments in order to prevent bias.
C. The scientists repeat the experiment because they think the researcher is lying.
D. Scientists repeat experiments in their spare time when they are bored.
Biology
1 answer:
natima [27]3 years ago
5 0
The answer is B. Scientist repeat the experiments in order to prevent bias.

Brainlest answer is always appreciated!
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Common rosefinches arrived in Hawaii roughly 6 to 7 million years ago and have since evolved into at least 56 new species of hon
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Answer:

A. Some speculate that they were blown out to the islands by a massive storm

Explanation:

The common rosefinches are thought to have arrived on the Hawaii islands between 6 and 7 million years ago. As the common rosefinches are not big birds and they can not fly over very long distances, the scientists believe that it is a massive storm that blow some individuals to the Hawaii islands. This is nothing weird, as it has been witnessed numerous times how massive storms manage to carry some smaller birds to places where they are not able to fly on their own. Once there, the birds encountered suitable conditions for living and lot of open niches in the food chain. This resulted in quick diversification of the common rosefinches, with members of the species gradually adapting to a particular niche, experiencing changes to be more competent, and creating numerous new species after some time.

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3 years ago
Question about nitrogen and phosphorous cycle? Which statements are true, list all that apply
vaieri [72.5K]

Answer: 1) When phosphorous is not bound in rocks, it moves quickly through land food webs. Constant use of phosphate-rich fertilizers will help increase phosphorus availability to plants, thus ultimately helping our ecosystems.

3) Minimizing the use of ammonia-rich fertilizers on lawns would not add excess nitrogen to the nitrogen cycle. As a result, it would help decrease the pollution of food webs in the oceans, decrease soil acidity on land, and decrease the amount of greenhouse gases in the atmosphere

Explanation:

The nitrogen and phosphorus cycles both are biochemical cycles. The nitrogen cycle involves the process of uptake of nitrogen from the atmosphere by the soil bacteria which is then become available to the plants for plant growth, from plants it is transferred to the other organisms in different forms.

The phosphorus is found in the rocks and these rocks wither and the inorganic phosphorus become available to the ecosystems.

Option 1 is correct, this is because the phosphorus is available on earth in the inorganic form inside the rocks, the withering and erosion processes make the phosphorus available to the plants. Another source of phosphorus to plants is phosphorus rich fertilizers. Thus plants will absorb phosphorus and grow. These plants will be consumed by other organisms thus the ecosystem will remain healthy.

Option 3 is correct, this is because nitrogen rich fertilizers can cause eutrophication in water bodies, or can contaminate the water. It will decrease the pH of the soil due to the formation of nitric acid. Also the nitrogen dioxide is the greenhouse gas.

 

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3 years ago
If the number of photosynthetic organisms on Earth decreased drastically, which would happen as a result? Less water would be av
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More co2 gas would be found in earth’s atmosphere.Because of less oxygen produced by plants
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7 0
3 years ago
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C) the sun warms the ground.

6 0
3 years ago
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scZoUnD [109]

Answer:

Explanation:

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