Any particular element can always be identified by its

number of electrons

number of protons

number of neutrons

atomic mass

What type of pollution does household garbage cause

Which of the following factors would not contribute to allopatric speciation? a) a population becomes geographically isolated from the parent population. b) the separated population is small, and genetic drift occurs. c) the isolated population is exposed to different selection pressures than the ancestral population. d) different mutations begin to distinguish the gene pools of the separated populations. e) gene flow between the two populations is extensive.

Nucleic acids offer variability because they contain alternate forms of genes called .