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tresset_1 [31]
3 years ago
9

A marine scientist observes that fish are found at higher concentrations closer to the coast of California than farther out in t

he Pacific Ocean. She concludes the fish populations are always large close to the coasts throughout all oceans. Why is this an invalid scientific conclusion?
a. She needs less data to draw conclusions.
b. Scientists should repeat this experiment at different sites to draw conclusions.
c. Scientists require laboratory-based experiments to draw conclusions.
d. Scientists always need long-term observations to draw conclusions.
Biology
1 answer:
gavmur [86]3 years ago
5 0

Answer:

Option B

Explanation:

When ever a scientific research or experiment is conducted , it is made sure that the results obtained are consistent through multiple trials. Here , only two trials are done i.e one on coast of California and the other on the Pacific Ocean.

Since the number of samples taken for this study are not as per the standard sample guidelines and hence the result obtained can not be considered as a acceptable.

Thus, option B is correct

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6 0
3 years ago
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Bacteria and other microbes can be used to "clean up" an oil spill by breaking down oil into carbon dioxide and water. Two sampl
SVETLANKA909090 [29]

Answer:

Sample A

T= 21.3% and A= 21.3%

G=28.7% and C= 28.7%

SAMPLE B

T=28.7% and  A= 28.7%

G= 21.3% and C= 21.3%

Sample A would have higher melting temperature

Explanation:

According to given information, sample A contains 21.3% thymine.

Percentage of adenine in sample A= 21.3% (Since adenine base pairs with thymine, so, adenine and thymine are present in equal amount in a double stranded DNA)

Total of A+T in sample A= 21.3 + 21.3 = 42.6%

G+ C content of sample A= 100-42.6= 57.4%

Percent G content of sample A = 57.4/2 = 28.7%

Percent C content of sample A = 28.7%

SAMPLE B:

According to the given information, sample B contains 28.7% thymine.

Therefore, percent of Adenine base in sample B= 28.7%

Total of A+T content in sample B= 28.7 + 28.7 = 57.4%

G + C content of the sample B = 100-57.4= 42.6%

Percent G content of the sample B= 42.6/2= 21.3%

Percent C content of sample B = 21.3%

There are three hydrogen bonds between a GC pair while there are only two hydrogen bonds between AT pair. The DNA content with higher GC content has higher melting temperature. Therefore, sample A would have higher melting temperature.

4 0
4 years ago
NASA launches another satellite into the _____.
nadezda [96]
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3 years ago
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Nadusha1986 [10]

Answer:

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3 years ago
In some cases, a population of one species disperses throughout an area, and over time, one species evolves and becomes more. In
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Answer:A

Explanation:i chose B and got it wrong

usa test prep

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