Why is carbon able to form so many compounds?

carbon atoms can bond to each other to an extent not possible for other elements.
carbon atoms can only form chains.
carbon atoms can only form rings.
carbon atoms can only form single bonds.

What is the percentage by mass of silicon (si) in iron aluminum silicate (fe3al2(sio4)3)?

Describe the difference between a. a hypothesis and a theory and b. an observation and an experiment.

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.