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Svetllana [295]
3 years ago
15

What happens during primary wastewater treatment? Choose one: A. Insoluble particles are removed by settling. B. Microbes are ad

ded to oxidize organic compounds to carbon dioxide. C. The wastewater is pumped into drinking water reservoirs. D. The wastewater is chlorinated to eliminate pathogens.
Biology
1 answer:
4vir4ik [10]3 years ago
3 0

Answer: The process that happens during primary wastewater treatment is:

A. Insoluble particles are removed by settling.

Explanation: Settling is an operation that removes suspended particles in the water to be treated.

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A museum curator collects fossils from two different periods. He has 400 from one period and 204 from a later period. He plans t
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Answer:

4

Explanation:

Number of fossils collected over period 1:

400

Number of fossils collected at a later period :

204

For each display case to have the same number of fossils ; the greatest number of fossils possible per case:

Obtain the greatest common factor of both 400 and 204

400 = 1, 2, 4, 5, 8, 10, 25, 40, 50, 80, 100, 200, 400

204 = 1, 2, 3, 4, 6, 12, 17, 34, 51, 102

Hence, the greatest common factor (400 and 204) is 4

Hence, the greatest Number of Fossil possible per case = 4

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2 years ago
Competition among members of the same species is called
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Intraspecific competition

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3 years ago
In general, why might cell-wall inhibiting antimicrobial drugs be less effective on gram-negative bacteria compared to gram-posi
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Cell-wall inhibiting antimicrobial drugs be less effective on gram-negative bacteria compared to gram-positive bacteria because the outer membrane of the gram-negative bacteria inhibits penetration of the drug and the peptidoglycan found in gram-positive bacteria is structurally different from that in gram-negative bacteria.  

Answer: Option B & C

<u>Explanation:</u>

Antimicrobial drugs are induced into a body to act on that particular selective bacterium which causes disease. When antimicrobial drugs are injected they act efficiently on the gram positive bacteria inhibiting the proliferation of the cells by acting on the cell wall so that cell multiplication doesn’t happen.

On the other hand it is hard to act on the gram-negative bacteria as it has a cell membrane that inhibits drug penetration into it. Both cell walls contain peptidoglycan but in the gram-positive is more assembled and layered while in the gram-negative it is just a thin layer. As gram-positive is thick layered it provides place for another molecule to attach to it but the thin layer in gram-negative inhibits it.

4 0
3 years ago
The twisted ladder shape of DNA is called a double ____.?
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<span>The twisted ladder shape of DNA is called a double </span>helix.
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All claims in science should be supported by
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Evidence

Hope this helps. Have a great day! :)
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3 years ago
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