30 points if you can help me with this chemistry question

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.

What does the mass of 0.7891 mol of ferric oxide (fe2o3)

Which element is the least metallic between cadmium, silver, zinc, or iron?