Assume that a population of one of these finch species is undergoing evolution by natural selection with respect to beak size and shape. what changes occur gradually over time that indicate the population is evolving?

the sugar-phosphate backbone forms the structural framework of nucleic acids, including dna and rna. this backbone is composed of alternating sugar and phosphate groups, and defines directionality of the molecule.

the answer is cell division : )

which

what is a measurement of the earth’s history divided into time periods?

> fossil record <

sedimentary rock

> geologic time scale <

radioactive elements