J. j thomsons cathode-ray tube experiment showed which of the following
a. electrons are in a cloud surrounding positively charged particles
b. atoms consist of at least some negatively charged particles
c. atoms are small individual spheres
d. matter can be neither created or destroyed

Temperatures in ponds and lakes vary by season. select the best answer from the choices provided t f

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.

First dropdown options: a. runoff b. condensation c. evaporation second dropdown options: a. photosynthesis b. transpiration c. sweating third dropdown options: a. raindrops b. clouds c. animals