Difference in density between the two liquids
Molecular clocks because the m<span>easure changes in DNA or proteins to indicate degrees of relationship among species.Molecular clocks, together with evidence from the fossil record, allows scientists to estimate how long ago various groups of organisms diverged evolutionarily from one another</span>
CO2 ; H20- They are the only ones that, on both sides, combined with another element and bonding of atoms
: A chemical process of decomposition involving the splitting of a bond by the addition of water.
