Refers to how a body system functions.

Does the sun release radiant energy?

The similarities of organisms in which two areas numbered above provide the best evidence for common ancestry between organisms in both locations?

Ivan is looking at a cross section of a stem taken from a vascular plant. he sees two different types of vascular tissue: the xylem, which is closer to the center of the stem, and the phloem, located around the xylem, closer to the outside of the stem. how do these two structures work together in a living plant?