4) All sound waves need particles to transfer energy. The particles make up the A. Energy
B. Equilibrium
C. Medium
D. Minimum

C. Medium

Explanation:

Compression

the part of a wave where the particles of the medium are closer together

the "dirty dozen" chemicals banned in an international treaty are formally known as persistent organic pollutants, or pops. the united nations environment program provided this background on what they are and what they can do to humans and wildlife.

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answer: 45

explanationyou have to add as well to be it could be