MCAS Biology Practice

Category - Biology

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About 70 years ago, cane toads were introduced to Australia. The toads are toxic to some species of snakes, such as Dendrelaphis punctulatus. The longer an individual snake is, the greater its chance of survival after eating a cane toad. Which of the following did scientists most likely observe in the D. punctulatussnake population as a result of the presence of the cane toads?

The entire population was killed by the toads.
The entire population became resistant to the toads.
The average body length in the population increased.
The average body length in the population decreased.

Explanation

Answer: C - The average body length in the population increased.

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