What best describes a sound wave? transverse and electromagnetic longitudinal and mechanical longitudinal and electromagnetic transverse and mechanical

Sound needs medium to travel and it can not travel without medium

so sound wave is a travelling wave

now we also know that sound wave propagate in form of rarefaction and compression.

So all medium particles travel in the direction of wave only

so it is a longitudinal wave also

so correct answer will be

mechanical longitudinal

longitudinal and mechanical

Explanation:

It's right on Edge

the skeletons of most mammals reach a certain size and then stop growing. however, many animals, including some mammals, keep growing throughout their lives. kangaroos, for example, just keep growing and growing until they die. also, the longer an animal lives the greater the chance it might catch some deadly disease.