Greases are semisolid lubricants composed of a thickening agent dispersed in a liquidlubricant. They are used to reduce friction and wear between moving parts, as well as to provide a barrier against moisture and debris in various mechanical systems.
From Molecules to Organisms: Structures and Processes
Students who demonstrate understanding can:
Use argument based on empirical evidence and scientific reasoning to support an explanation for how characteristic animal behaviors and specialized plant structures affect the probability of successful reproduction of animals and plants respectively.