Two common liquids, water and peroxide, are both formed with atoms of hydrogen and oxygen. If both substances discussed above are made of hydrogen and oxygen, how is the make-up of the two substances different? A. The number of atoms of each element is different.
B. The number of protons in the atoms of each element is different.
C. The number of neutrons in the atoms of each element is different.
D. The number of electrons in the atoms of each element is different.

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when the displaced particles are perpendicular to the direction the wave travels, is called a transverse wave, whereas in longitudinal wave the displace practices are parallel to the direction of the wave.

in the given image:

first image shows - longitudinal wave

second image shows - transverse wave

third image shows - longitudinal wave

fourth image shows - longitudinal wave

i think the answer is composed of atoms