What organ lies over the surface of the heart

One important development during the 3rd trimester that will insulate the infant against changes in temperature is a. the deposition of fat under the skin b. the closing of the septum between c. the atria of the heart d. the beginnings of lung functioning e. the beginnings of light and sound sensing

Make a claim about the factors that cause inherited genetic variations within populations. also make a claim about the effects of mutations.

Why does sexual reproduction result in more genetic variation in a species