Astudent sets up an experiment with two plants that are each exactly five inches tall. one is given fertilizer and the other is not. after 4 weeks their height is measured again. what is wrong with this experiment? a) there is no control for this experiment. b) plants grow slowly. the time frame is too short. c) the plants need to be taller to get accurate measurements. d) plants naturally grow at different rates. more trials need to be done.

i do not know and i have a 100 in this class

correct answer is option a.

tropopause, stratopause and mesopause have all in common aspect that is point of maximum temperature in its layer of the atmosphere. all layers of atmosphere observe abrupt change in temperature. tropopause is the boundary between troposphere and stratosphere. stratopause is the boundary between stratosphere and mesosphere. mesopause is the boundary between mesosphere and thermosphere. these all boundaries are ranges between altitude of 0 to 80 km.