How did the control group differ from the experimental group in the 2005 peacock butterfly experiment?

They were spotless and soundless

Explanation:

The control group is used as a reference to compare the result obtained from the experimental group.

The control group differ from the experimental group in the 2005 peacock butterfly experiment in ways such as the control groups of butterflies having their spots covered with paints. A small part of the peacock’s wings were also removed to prevent them from making sound.

This validates them being spotless and soundless

i'm thinking (a) to keep sand in place; ////////////

explanation: a sand fence or sandbreak, like a snow fence, is used to force windblown, drifting sand to accumulate in a desired place. sand fences are employed to control erosion, sand dune stabilization, keep sand off roadways, and to recruit new material in desert areas.

not too sure but maybe in the hot springs.