Calcium nitrate + aluminum hydroxide balanced equation

Iknow the answer to 13 is b and 14 is d. i just need to know why the correct answers are correct

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.

Which characteristics can be used to differentiate star systems? check all that apply.