Compared with the walls of arteries, the walls of capillaries.
a. are thicker
b. are thinner
c. lack valves
d. have more resistance

What does natural resource management aim at ?

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

Explain the process that creates the heat of the sun?