The doppler effect is a change in the observed frequency if there is relative motion between
a. two sources
b. two observers
c. a source and an observer

Glycogen is an energy-storage molecule in humans. a hormone that is called insulin controls the storage of glycogen in the liver. insulin is made up of amino acids.

Which of the following is the scientific term for an organism that makes its food from inorganic materials? a.autotroph b.heterotroph c.embryotroph

Which animal receives the greatest amount of the original energy found in the producers