Which of the following is an example of homeostasis? A. The lungs of animals excrete carbon dioxide. B. The beaks of some birds are hooked in shape. C. We feel cooler when we stand under the shade of a tree. D. We feel warmer when all the windows are shut on a cold night.

Which statements best describe the differences or similarities between a comparative investigation and an experimental investigation? check all that apply. experimental investigations are best for showing cause-and-effect relationships, while comparative investigations do not necessarily show this type of relationship. comparative investigations are often impractical and unrealistic, while experimental investigations are the most practical and realistic kinds of investigations. comparative investigations allow for the use of a wide range of variables but do not have a control group, while experimental investigations involve variables that can be controlled. both experimental investigations and comparative investigations are designed to answer scientific questions. both experimental investigations and comparative investigations focus on making observations rather than collecting new data.