Question

A scientist believes that bright red chest coloring on male birds makes them more attractive to females. In an experiment, she uses six birds, all with the same color chest. She bleaches the feathers of two of the birds, dyes the chests of two of the birds bright red, and leaves the chests of two of the birds alone. When females are exposed to these males, she believes that more females will chose to mate with the red-dyed males. What is the control group in this experiment?

Answer 1

The control group would be the birds she left alone, because the coloring on the birds remained the same. 
I hope this helped you.

Answer 2

Answer:

The correct answer will be- two birds with non-bleached chest.

Explanation:

A scientific experiment is performed to test the hypothesis predicted or proposed.

The experimental design contains two types of samples: experimental samples in which the independent variable is to be tested and the control samples in which the independent variable is kept constant.

In the given question, since the independent variable to be studied is the red color of the chest, therefore, the birds with bleached wings and the chest will be considered experimental samples.

The birds whose chest was not bleached will be considered control "sample"and is the correct answer.