Boris is riding his bike on a path of hard sand. when he rides on a paved path, he can pedal his bike more easily. he can ride more easily on pavement because there is less a) drag. b) lift. c) friction. d) gravity.

Explain how paleontologists use trilobite fossils as index fossils for various geologic time periods.

Which of the following is the earliest era of earth's geologic time scale? cenozoic mesozoic precambrian paleozoic

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.