What is the difference between the number of neutrons in an atom of barium, Ba, and the number of neutrons in an atom of Chlorine, Cl?

How do you transfer mrna into codons ? i'm so confused : (

Use the phylogenetic tree to the right to determine which statement below is true. organisms a and f are not related. organism e is more closely related to organism b than organism f. organisms c and d are more closely related than organisms a and b. phylogenetic trees

Which characteristics are typical of a human population in the postindustrial stage?