A bacterial culture has an initial population of 2 × 10⁶ cells. After 3 hours of exponential growth, the population becomes 1.6 × 10⁷ cells. Calculate the number of generations (n) that have occurred in this time.

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#Question id: 4615

#XL - T Zoology

Currently, two of the living elephant species (X and Y) are placed in the genus Loxodonta, and a third surviving species (Z) is placed in the genus Elephas. Assuming this classification reflects evolutionary relatedness, which of the following is the most accurate phylogenetic tree?

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#Question id: 4616

#XL - S Microbiology

Logically, which of these should cast the most doubt on the relationships depicted by an evolutionary tree?

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#Question id: 4616

#XL - T Zoology

Logically, which of these should cast the most doubt on the relationships depicted by an evolutionary tree?

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#Question id: 4617

#XL - S Microbiology

Which of the following is not an observation or inference on which natural selection is based?

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#Question id: 4617

#XL - T Zoology

Which of the following is not an observation or inference on which natural selection is based?

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#Question id: 4618

#XL - S Microbiology

Which of the following observations helped Darwin shape his concept of descent with modification?