How might changing the shape of compacted trash change the way we use it?

What are the similarities of physical and chemical change ?

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.

Of the following elements, which is the least reactive? a. c b. h c. li d. he