1. What are the main principles of the cell theory? Choose all that apply. All living things are made of cells. O All cells have a nucleus. O Cells are the basic units of life. Cells only come from other cells.​

This classification of drug typically changes the brain's chemistry and reduces its ability to create its own endorphins.

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