1. define negative feedback. explain how this relates to the concept of homeostasis.
2. define positive feedback. explain how this relates to the concept of homeostasis.

Draw the skeletal structures of two different molecules that are each made of 5 carbon atoms and 12 hydrogen atoms.

Mercury metal is poured into a graduated cylinder that holds exactly 22.5 ml the mercury used to fill the cylinder mass in 306.0 g from this information calculate the density of mercury

State one important difference between a physical change and a chemical change?