Which might you use to observe the properties of matter? smell
taste
sight
all of the above

What provides structure to the human body?

This chart lists four kinds of polymers and their sources. what can be known about all four polymers, despite their differences? they come from living things. they share ionic carbon bonds. they are at least 100 monomers long. they are made of repeating subunits.

In 2002, the rare earth elements mine in mountain pass, california was closed because