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Elza [17]
3 years ago
14

A leech feeding off of human blood is an example of 1

Biology
1 answer:
RoseWind [281]3 years ago
8 0

Answer:

Parasitism

Explanation:

Here, the leech benefits a meal from the human, but the human is harmed by losing blood.  Therefore, it is a parasitic relationship.

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Natural Selection: Mastery Test
Finger [1]

Answer:

Genetic diversity in a small population, with a high level of genetic drift and with very little migration will decrease because existing alleles will be lost and few new alleles will be introduced over time (option A).

Explanation:

Evolution - linked to the natural selection and perpetuation of a species - depends, in large part, on three fundamental factors to make it happen:

  • Mutations .
  • Genetic drifts.
  • Migrations.

In small and isolated populations, very little genetic variation, high levels of genetic drift and very few mutations can be observed, which could lead to some alleles being lost and the species may become extinct.

Genetic drift (GD) is an important factor in terms of natural selection, as it is the result of allelic variations that occur from one generation to another. In large populations, GD is low, given the cross between different individuals is greater. A characteristic of GD in small populations is that their levels are very high, and this leads to the eventual loss of alleles.

In this small population, without the possibility of migration -few new alelles will be introduced- genetic variation will decrease, due the genetic flow is low, reducing reproductive fitness and weakening the population's resistance to environmental changes, which could result in the long-term extinction of the species.

Learn more:

Genetic drift brainly.com/question/6389220

8 0
3 years ago
Why are enzymes important to humans? because they allow reactions to occur at body temperatue?
Olin [163]
Enzymes are catalysts, meaning that they are proteins that speed up reactions.  So without them, there would be barely any activity.
6 0
3 years ago
Hey guys what is your fav animal
Tatiana [17]

Answer:

My favorite animal is either a bunny or wolf

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WHATS A FISHI??------------------------------
Sav [38]

Answer:

any of a large group of vertebrate animals that live in water, breathe with gills, and usually have fins and scales

Explanation:

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How does the composition and structure of the atmosphere ensure the protection of the earth
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This is only one part of the answer, but its important: high-altitude O2 absorbs much energy from the sun (including radioactivity), which forms the ozone layer. this process protects delicate molecules important to life - most notably dna
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