When measuring the volume of water in a graduating cylinder, you measure. at the top of the meniscus
from the bottom of the meniscus
from the exact top of the liquid
the average between the volume at the top of and the bottom of the meniscus

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.