How many federal agencies are responsible for managing land resources in the United States? 2
4
6
10

Competition occurs between species when

Which of the following was not a major animal on land during the carboniferous period? amphibians insects both a and b none of the above

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.