Wave able to travel through only through solids, moves in a side to side or up down motion, slow

P-wave
Q -wave
R-wave
S-wave

S-Wave

Explanation:

S-Waves are only able to travel through solids, and are known for moving in a side to side or up and down.

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during the process of dna replication, brdu can replace thymidine and incorporate into the newly synthesized dna, cell proliferation thus can be reflected in the extent of brdu incorporation.