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SVETLANKA909090 [29]
2 years ago
11

Which of the following is a major benefit of commercial agriculture? O A. Loss of habitat B. Overconsumption of water C. Product

ion of primary food crops O D. Synthetic fertilizers​
Biology
1 answer:
zavuch27 [327]2 years ago
4 0

Answer:

C.  Production of primary food crops

Explanation:

Loss of habitat and overconsumption of water are big drawbacks of commercial agriculture.  Synthetic fertilizers tend to be necessary with commercial agriculture, but they are heavy polluters and tend to destroy waterways, so they are a big drawback of commercial agriculture.

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Which of the following investigators was (were) responsible for the following discovery? In DNA from any species, the amount of
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Answer :Erwin Chargaff   a Biochemist

Explanation:

He formulated the base paring of double helix of DNA. He reasoned that since the percentage of four  DNA  bases are of this proportions in human;

                                  Adenine=30.9% and Thymine =29.4%;

                                  Guanine=19.9% and Cytosine =19.8%

Then,  the amount of adenine will always be equal to thymine,

And the amount of Guanine equals to cytosine based on this percentages of distribution.  

(Adenine and Guanine are large, molecule of Purines, while thymine and Cytosine are Pyrimidine)  

 

He concluded (although scientist believed, he did not explicitly stated this) that this should be the base paring patterns in DNA molecule. This is the first Chargaff Rule.

His second rule is that the DNA composition, in the relative amount of the four bases Adenine, Thymine, Cytosine and Guanine varies in proportion from one organisms to another. And this is the basis of molecular diversity.

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3 years ago
Which characteristics describe this rock sample? Check all that apply. large crystals coarse texture evidence of rapid cooling f
Lena [83]

Answer:

a, b, e

Explanation:

You just have to pay attention to what you see

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