In the Course of Observing Cacti from Several Islands, Researchers

In the course of observing cacti from several islands, researchers noted that on islands where cacti had been grazed by cows, they developed more spines per plant. This example shows that

A) neither cacti nor cows are native to these islands.
B) cows are not discouraged from eating spiny plants.
C) herbivory can be a selective force.
D) cacti on islands without cows are unable to produce spines.

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