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andrew11 [14]
3 years ago
13

Why would natural selection not occur without genetic variations in species?

Biology
1 answer:
Mumz [18]3 years ago
8 0

If you do not have variations to be selected by natural or sexual selection on their superior abilities to survive and reproduce successfully then nothing can be naturally selected against the immediate environment.
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Antagonsitic effect/interaction/response

In order to combat antiobiotic resistance, and to possibly enhance the activity of antibiotics, they are sometimes used in combinations during treatment. However, three possible responses or effects can manifest. 

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The effect is also distinguished from another type of response, which is additive effect, where the combined effect of the antibiotics is more or less equal to the combined activity/potency of each of the antibiotic when applied singly. Antibiotic synergy results in even greater enhancement of the activity of the combined antibiotics compared to additive effect. 

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3 years ago
Which of these words or phrases are directly related to the mass extinction event that occurred 65 million years ago?
Gre4nikov [31]

Answer:

F. is the only mass extinction even to have occurred

Explanation:

its only f

6 0
3 years ago
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Anna71 [15]

Answer:

Lack of shelter.

Explanation:

Although I cannot see the graph of the population over time, I am assuming it was exponentially rising and then began to decline. This is because the parrotfish were able to populate only until the species ran out of shelter. Once it ran out of shelter, the exposed fish began to die due to predators or the environment.

It may also be because of the drastic decline of living coral reefs. As coral reefs die, so do livable habitats for the parrotfish. As a result, the parrotfish decrease in population as fewer corals are available for the fish to live in.

6 0
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Can you curl your tongue? Tongue-curling in humans (T) is a dominant genetic trait. Derek can curl his tongue but his wife, Ashl
nataly862011 [7]

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4 0
3 years ago
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goblinko [34]

the total number of pushes all together will be <u>8</u><u>N</u>

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