Answer:
A 2008 study suggests that sympatric speciation has occurred in Tennessee cave salamanders.
Explanation:
Hope this helps
Some have spines on their skin such as horned toads.
Some emit a slime when scared that will make the predator ill like toads.
Some use camouflage.
Some have thorns on them Like the porcupines.
Correct Answer is A. They were able to increase their productivity due to the popularity of tractors.
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