What are the themes in biology that come up again and again?

Here are some of the themes in biology that come up again and again:
-cellular basis of life
-information and heredity
-matter and energy
-development and reproduction
-homeostasis
-evolution
-structure and function
-unity and diversity of life
-interdependence in nature
-science as a way of knowing

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