Why do so many different animals have the same structures? (for example, the arm bones in a human are the same bones as a flipper in a whale)

People who exercise for an hour may have lower cholesterol levels. is that a statement? a law? or a hypothesis?

Which statement describes the reaction for cellular respiration? the equation is carbon dioxide + water → glucose + oxygen + water and energy is required in the form of light the equation is glucose + oxygen → carbon dioxide + water and energy is produced in the form of atp. the equation is carbon dioxide + water → glucose + oxygen + water and energy is produced in the form of atp. the equation is glucose + exygen carbon dioxide + water and energy is required in the form of light.

This is the process of making a prediction based on the results of prior observations of similar events.