PLEASE HELP ME SEVENTH GRADE

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.

Select all of the methods through which a drug can enter your body. injection swallowing inhalation absorption

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation: