Which pair would probably have agreed with the process that is depicted by this tree?

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#Question id: 12111

#Section 1: Ecology

Which of the following is a tertiary consumer?

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#Question id: 10657

#Section 2: Evolution

Assuming these age-structure diagrams describe human populations, in which population is unemployment likely to be a societal issue in the future?

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#Question id: 12456

#Section 1: Ecology

Choose the factor that is unlikely to limit population growth.

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#Question id: 15722

#Section 2: Evolution

The variation that arises is directed toward fixed goals, so that a species evolves in a predetermined direction by some kind of internal drive, without the aid of natural selection. This hypothesis is known as,

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#Question id: 3290

#Section 2: Evolution

Dog breeders maintain the purity of breeds by keeping dogs of different breeds apart when they are fertile. This kind of isolation is most similar to which of the following reproductive isolating mechanisms?