A nucleic acid that consists of one polynucleotide chain that helps in making proteins in a cell is
a ) polynucleotide
b ) DNA
c ) RNA
d ) nucleotides

Which of the following can occur to two segments of a population if they are geographically isolated 1.) they can only share some types of genes 2.)both groups most likely become extinct 3.)they find a way to come back together 4.)eventually they become separate species