Based on molecular clocks, Goodman's phylogeny places the last common ancestor of all primates at .

63 MYA

Explanation:

Morris Goodman was a editor-in-chief of the journal Molecular Phylogenetics and Evolution.

In his classification, every organism was traced back to its last common ancestors, and he traced that of primates last common ancestors to be dated as far back as 63 MYA.

hydrogen is a compound or a single element and a element is a pure substence that cannot be separated into simpler subtances

clorine is a compound its a chemical substance that forms when two or more different elements combine

so both hydrogen and clorine are compounds