Which items are related to the autonomic nervous system? heartbeat
breathing
muscle coordination
involuntary muscles
digestion
finger tips
sweating

What are the two main phases of a cell cycle

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?

Identify two examples of chemical reactions that you have encountered during the last week. identify an exothermic and endothermic reaction. explain.