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#Question id: 4569


Which of the following must exist in a population before natural selection can act upon that population?

#Microbiology
  1. Genetic variation among individuals

  2. Variation among individuals caused by environmental factors

  3. Sexual reproduction

  4. B and C only


Answer:- Option(s): 1


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#Question id: 1563

#Human Biology

A nonfunctional CD4 protein on a helper T cell would result in the helper T cell being unable to ________.

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#Question id: 1564

#Human Biology

When antibodies bind antigens, the clumping of antigens results from ________.

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#Question id: 1565

#Human Biology

Which of the following are symptoms of inflammation that might appear in such art?

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#Question id: 11908

#Human Biology

What is the phenotype of a person who has XXXY sex chromosomes?

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#Question id: 12173

#Human Biology

Female with only one X chromosome is a characteristics of individual with

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#Question id: 11665

#Human Biology

Materials are returned to the blood from the filtrate by which of the following processes?

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