Science 176-185

this is a group of various organisms living in specified region

this is the life function that involves the release of useless materials

this is the system of an organism that involves the skin. It prevents harmful substances from entering the body

this is the temperature at which a solid changes into a liquid

this is the life function that involves an organism's reaction to the environmental stimulus

this refers to the rate at which something is traveling

this is the upward force applied by our atmosphere to a falling object

this is energy that is stored and not currently in motion

this refers to how much space an object occupies

this is a simple machine consisting of two circular objects of different sizes.
A doorknob is an example of this.