What does a control group show in an experimental investigation?

The correct answer will be option-how nature would act without manipulation.

Explanation:

A scientific experiment is designed in a way that it can be categorized into two groups:  

1.  experimental samples-in which the variable to be studied is present and other variables can be manipulated.

2. Control group: samples in which the variable to be tested is not present and thus contains only independent variables. The control group provides the data which shows how nature acts when no manipulation is done to the variable which acts as a reference group to the experimental group.

Therefore, the selected option is the correct answer.

unicellular organisms, like bacteria, are able to perform all life functions within one single cell. multicellular organisms need many different types of cells to carry out the same life processes. each of these special types of cells has a different structure that it perform a specific function.