How are sugar molecules in living things classified? as proteins
as nucleic acids
as
lipids
as carbohydrates

According to the theory of punctuated equilibrium, at what rate does speciation occur? species change depending on the rate of natural selection. after periods of stasis, new species evolve relatively rapidly. species change slowly and eventually form new species. some species change quickly and others change slowly to balance the overall rate.

What percentage of light hits earth's surface directly?

The two main stages of cell division are called