Which of these is a significant event of vascular plants?
a) they were the first plants to colonize land.
b) they gave rise to mosses.
c) they maintain ecological balance by preventing desertification.

What mistake did john needham make that caused him to conclude that spontaneous generation for microorganisms occurred? a. he re-contaminated his boiled broth solutions. b. he destroyed the vital force in the solutions. c. he did not boil his broth solutions, only warmed them. d. he failed to seal his flasks of boiled broth. e. he allowed his assistant to conduct the experiment which he did not monitor closely.