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poizon [28]
3 years ago
13

What must be true for natural selection to happen?

Biology
1 answer:
Mila [183]3 years ago
3 0

Answer: Four conditions are needed for natural selection to occur: reproduction, heredity, variation in fitness or organisms, variation in individual characters among members of the population. If they are met, natural selection automatically results.

Explanation:

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Under which circumstances should we try to control the population numbers of Pfiesteria?
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Pfiesteria species generally found in estuaries, the population of which are needed to be controlled only when they becomes toxic. Presence of large of fish triggers toxicity in Pfiesteria.

Explanation:

Pfiesteria are known to be associated with fish kills as for example large fish kill in the seas of North Carolina. It also causes blooming of algae in enormous numbers thus make the water bodies, hostile for survival of fishes and other marine lives. It affects human too by release of toxins in air and water often resulting in respiratory problems, infections of gastrointestinal system, headaches and fatigue. In this type of grave circumstances, leading to outburst of population of Pfiesteria, there is an urgent need to control.

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Many soil-dwelling bacteria produce molecules that can be naturally synthesized and kill other species of bacteria. What are the
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Many soil-dwelling bacteria produce molecules that can be naturally synthesized and kill other species of bacteria. What are these bacteria-killing molecules called antibiotics

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Antibiotics can also interfere with other medications you may be taking. Antibiotic side effects account for nearly one-fifth of  emergency room visits. These conditions are the most common reasons for emergency room visits for children under the age of 18. Taking antibiotics you don't need unnecessarily exposes you  to the drug's side effects and denies you the benefits.

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5 0
1 year ago
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Who is in the same trophic level as the frog? Select all that apply.
Degger [83]

Answer:

Frog, grasshopper, and rabbit

Explanation:

depending by the region, these may vary, but these are at or near the same trophic level

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2 years ago
Diffrence beetween.<br>Melting and condensation .​
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Explanation:

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The answer tot his question is:

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3 years ago
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