At what height does a person experience altitude sickness?

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#Question id: 4562

#Section 2: Evolution

Which stratum should contain the greatest proportion of extinct organisms?

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#Question id: 4713

#Section 2: Evolution

A farmer uses triazine herbicide to control pigweed in his field. For the first few years, the triazine works well and almost all the pigweed dies; but after several years, the farmer sees more and more pigweed. Which of these statements explains why the pigweed reappeared?

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#Question id: 9568

#Section 1: Ecology

Which of the following represents a plant adaptation that minimizes water loss in arid environments by increasing the thickness of the boundary layer?

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#Question id: 3483

#Section 2: Evolution

Which of the following statements about evolution of behavior is correct?

A) Natural selection will favor behavior that enhances survival and reproduction.

B) An animal may show behavior that maximizes reproductive fitness.

C) If a behavior is less than optimal, it is not completely evolved but will eventually,become optimal.

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#Question id: 5923

#General Aptitude

What day on 23/04/1990 ?