Weismann cut off the tails of mice generation after generation, but tails neither disappeared nor shortened, proving that _______.

Weismann cut off the tails of mice generation after generation, but ta

1.	Weismann cut off the tails of mice generation after generation, but tails neither disappeared nor shortened, proving that _______.
Answer» Weismann cut off the tails of mice generation after generation, but tails neither disappeared nor shortened, proving that _______.