The rope is blurred ahead of peak of pulse and behind it but not peak itself. explain

the answer is d. 4

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the part of the wave he is travelling on is the crest

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.