Why is the pocket mouse an example of natural selection?

Look at the following answer choices and determine which belongs in the both category. testable, can be disproven explains natural phenomena, has evidence to support it prediction, tentative, one or more scientists working together well established, many different scientists working independently, highly reliable

A60-tooth gear is connected to a 72-tooth gear. if the smaller gear turns 12 times, how many turns does the larger gear make?

What environmental cues and landmarks do the geese use to determine the timing and direction of their migration over the mountains? how do they find their way?