Stacy's home is sprayed with a pesticide to control spiders. she didn't see any spiders for a period of time, but eventually, she began to see the spiders again. the next time the exterminator sprayed her house, they used the same pesticide, and it had no effect on the spiders. what is the best way to explain this change in survivorship of the spider population? a. the spiders with pesticide-resistant traits survived and reproduced. b. the original spider population did not pass on their genes to their offspring. c. the original spider population was not very diverse. d. the spiders learned to avoid the pesticide.

Your starship, the aimless wanderer, lands on the mysterious planet mongo. as chief scientist-engineer, you make the following measurements: a 2.50-kg stone thrown upward from the ground at 14.0 m/s returns to the ground in 5.70 s ; the circumference of mongo at the equator is 2.20×10^5 km ; and there is no appreciable atmosphere on mongo. (a) the starship commander, captain confusion, asks for the following information: what is the mass of mongo? (b) if the aimless wanderer goes into a circular orbit 2.20×10^4 km above the surface of mongo, how many hours will it take the ship to complete one orbit? (c) an unmanned spacecraft is in a circular orbit around the moon, observing the lunar surface from an altitude of 44.0 km . to the dismay of scientists on earth, an electrical fault causes an on-board thruster to fire, decreasing the speed of the spacecraft by 23.0 m/s . if nothing is done to correct its orbit, with what speed (in km/h) will the spacecraft crash into the lunar surface?