The wavelength of a wave is the length of one complete cycle of a wave. for a transverse wave, the wavelength is determined by measuring from crest to crest. a longitudinal wave does not have crest. in this case the wavelength can be determined by measuring the distance between any two corresponding points on adjacent waves. in the case of a longitudinal wave, a wavelength measurement is made by measuring the distance from
a) peak to peak.
b) trough to trough.
c) wavelength to wavelength.
d) compression to compression.

D) compression to compression.

Explanation:

The longitudinal wave moves in the same direction that the bodies in its path oscillate.

To exemplify this type of wave, let us now consider a person speaking or a speaker emitting a certain sound. The sound (mechanical wave) of the person's voice propagates in space in all directions (for this reason, the sound wave can also be characterized as a three-dimensional wave), moving away from the source. The sound, being transmitted in the air, produces compressions and rarefactions. According to the sound sequence emitted by the person, we can have layers of air more compressed or less compressed, as it is represented in the figure as light regions and dark regions. The distance between a light and a dark region represents half a wavelength (λ / 2).

For a transverse wave, the wavelength is determined by measuring from crest to crest, however a longitudinal wave has no crest and its length is made by measuring the distance from compression to compression.

it has to be understood that the sea water contains a huge amount of sodium and chlorine ions and if they enter the cell of the atlantic cod fish, the cell will shrivel and the fish will die. to avoid such a condition, the fish uses active transport for the purpose of removing the ions against the gradient.

explanation:

the atlantic cod is not a maritime osmoconformer. its native application of salts is less than that of the seawater it lives in. it is continually falling water from the gills to the ocean via osmosis.

countering that, the fish is going to be swallowing seawater. but since its internal collection of salts is lower than seawater, the fish will want to go free of excess salt, and since that's going upon a gradient, then active transport, requiring energy, must be used to pump out the salt. much marine fish use the organs to filter out the salt and these fish discharge very straight urine.

wegner's theory did not explain how the continents could move

explanation: