What do we call the variable manipulated or tested by the investigator? 1. the independent variable

2. the constant variable

3. in inference variable

4. the dependent variable

Which of the following is not considered an appendage of the skin? nails glands follicles none of the above

Radiometric dating is used to tell the absolute age of materials by studying the decay rate of radioactive isotopes. the decay rates of isotopes are constant and are expressed as .

What is the most appropriate method of gaining weight (muscle mass)