In the human body, oxygen is absorbed by the lungs and nutrients are absorbed by the
small intestine. in a single-celled organism, this absorption directly involves the

nucleus
chromosomes
cell membrane
chloroplasts

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.

Which nucleotide component contains nitrogen

What is responsible for the uneven heating between the poles and the equator on any given day