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Question
Cane toads were introduced from Hawaii to Australia in 1935 to combat the native cane beetles that were devouring sugarcane crops. After their release into parts of Queensland they have been advancing at about $$50$$ kilometres a year across Australia. Recently it has been observed that new generations of toads at the frontline of the spread have longer legs. Which of the following does NOT explain this observation?
A
Individuals with shorter legs are less likely to survive
B
In the original population of toads, natural variation meant that leg lengths varied between individuals
C
Longer legs enable individuals to travel faster and further than others
D
The spread is occurring at an increasing rate as their legs become longer
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Solution
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Correct option is D. The spread is occurring at an increasing rate as their legs become longer
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