39. It can reasonably be inferred from the first paragraph that the author feels descriptions of echinoderms' skin as "leathery" and "rubbery" are:
Your Answer is
Correct Answer is D
Explanation
According to the question stem, the skin located at L17-20 echinoderm is described as leathery: listless, rubbery and elastic. But sometimes a minimal skeleton (skeleton) is formed so the previous description is inaccurate. Item D fits the question.