The circulatory system supports the skeletal muscular system by:

a) sending nerve signals to the muscles.

b) breaking down glucose to release energy.

c) transporting glucose to the cells where it is broken down and energy is released.

d) the circulatory system does not directly support the skeletal muscular system.

Paleontologists have found plant fossils deep within the layers of the north polar region. these leaf fossils have been labeled as to the rock layers they were found in, with the lower numbers being layers close to the earth's surface and higher numbers representing deeper layers. according to the numbers of these four leaf fossils, what might you infer?