Adependent variable is
a. directly changed by the experimenter.
b. manipulated by changes to the independent variable.
c. a variable that is kept constant.
d. a variable that is used as a control

Explain the significance of thesaurus geographicus

This is the interaction of two organisms where one is and the other is neither nor harmed.

Fossils of ancestors of the modern horses show a small 4-toed almost dog-like browsing animal named eohippus over time the horses got larger lost toes and changed to a grazing diet what is the best explanation of why this change occurred