What is one example of the many things that is necessary for a stable
ecosystem?
A. Equal number of predators to prey
B. Energy Capture
C. A high ratio of omnivores

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?

Which of the following human activities resulted in the growth of the north american deer population?

_tissues respond quickly to outside stimuli a) epithelia b)nervous c)muscular d)muscular and nervous