According to Barry Commoner, there are Four Laws of Ecology. Explain how his laws govern the way nature does - and humans should - use energy and material resources in
order to protect biodiversity. The Four Laws of Ecology
a. Everything is connected to everything else.
b. Everything must go somewhere.
c. Nature knows best.
d. There is no such thing as a free lunch.

The basic building blocks of dna and rna are nucleotides

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