When a species exists for long periods of time with no change, and then suddenly experiences a rapid and significant change, a new species can emerge. what is this called?

Which macromolecules are polymers made of nucleotides (a) fatty acids (b) nucleic acids (c) carboxylic acids (d) amino acides

Which of the following is not a symptom of desertification? a) decrease in salt content of the soil b) lowering of the water table c) reduced surface water d) increased soil erosion e) loss of native vegetation

The same agricultural practices are used in every country of the world. select the best answer from the choices provided t f