Which characteristic is found in liquids and gases? a. has a fixed volume b. particles stay in a fixed position c. no particle movement d. takes the shape of the container

The answer to your question is letter D.

Explanation:

A. Has a fixed volume This is not the right answer, liquids and gases take the shape of the container in which they are.

B. Particles stay in a fixed position This answer is wrong, this characteristic is  of solids but not of liquids and gases.

C. No particle movement This characteristic is also of solids, in liquids and gases the particles can move.

D. Takes the shape of the container. This is the right answer, liquids and gases take the shape of the container.

in the analysis of systems that involve fluid flow, we frequently encounter the combination of properties u and pv.

the answer is symmetrical : )