By Cutting Off the Tails of Mice in 22 Consecutive

By cutting off the tails of mice in 22 consecutive generations,August Weismann demonstrated that the final progeny had

A) no tails at all.
B) tails that were shorter than those of any previous generation.
C) longer tails than those of any previous generation.
D) tails the same length as those of the first and subsequent generations.
E) a mixture of tail lengths.