If ʺxʺ indicates the location of fossils of two closely related species, then fossils of their most-recent common ancestor are most likely to occur in which stratum?

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#Question id: 10634

#Section 2: Evolution

Consider a population which is changing from one generation to the next as per the equation N(t) = R*N(t-1), where N(t) represents the size of the population at time t and R is a constant growth parameter. Under what condition is the population likely to go extinct?

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#Question id: 4935

#Section 2: Evolution

Which gas was least abundant in Earthʹs early atmosphere, prior to 2 billion years ago?

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#Question id: 10618

#Section 2: Evolution

Which of the following characteristic of an early community?

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#Question id: 10865

#Section 2: Evolution

In the Lotka-Volterra model of competition, coexistence between species 1 and species 2

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#Question id: 12100

#Section 1: Ecology

Prairie dogs once covered the expanses of the Great Plains. Their grazing made the grass more nutritious for the huge herds of bison, and a variety of snakes, raptors, and mammals   preyed on the rodents. In fact, the black- footed ferret (now endangered) specialized in prairie dog predation. Today, growing housing and agricultural developments have covered many prairie dog towns. Which of the following statements about prairie dogs is true?