Which of the following are considered macromolecules.

The answer is c i just finished taking the test

We can use solar powered cars or ride bikes instead of cars that burn fossil fuels

It depends on the surface of the levels. the rougher the surface, the greater is the frictional force. for rougher surfaces, you would need to exert greater force to move the object. the concept is that, you must overcome the frictional force in order to bring the object into motion. this is the reason why we add lubricants to the joints so they could easily move. this answer was on

The correct answer is a