Abby fills a graduated cylinder with 3 mL of water. She then drops a small rock into the cylinder, and the water level rises to the 5 ml
mark. What is the volume of the rock?
mL

How has the scientific community addressed the safety of chemicals? a. chemicals are repeatedly tested, even those that have existed for a long time. b. existing chemicals are tested if they have never been tested before. c. chemicals are tested if they are suspected to have caused a problem. d. only new chemicals are tested.

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

Chen drew a diagram to compare the ways in which different organisms obtain nitrogen. which label belongs to the area marked z?