Question 1:

Select the incorrect statement.

A. Over 80 % of an elephants tusk is visible-the rest lies inside the gums.

B. Aside from the elephant, the walrus has the largest tusks.

C. The tusks of a male elephant grow about 18 cm a year.

D. Biologists have found that the tooths weight and its need for muscular development has greatly influenced the development of the mammalian skull.

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