3. Snelgrove describes a fishing disaster that occurred where he grew up in Canada in an effort to explain how we are now experiencing "shifting baselines." Explain
what he means by this term.

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explanation:

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answer; the tunica intima also called tunica interna, consists of elastic fibers,connective tissue and smooth muscle cells;

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