When you carry an object while walking at constant speed in a straight line, you exert an upward force on the object. Why are you not doing any work on the object? Please help.

Ascientist separates a population of mice into two groups. what would most likely increase the rate of speciation in this population. a. teach the two groups different tricks b. allow the two groups to breed with each other c. put the two groups in different environment d. have the two groups live in identical ecosystems