Which tool did maurice watkins use when studying dna?

What did not occur in the proterozoic eon a)the oxygen levels increase greatly in the atmosphere, b)the emergence of the eukarya , c)muti cella’s eukaryotic organisms began to diversify, d)anaerobic bacteria kept thriving with more oxygen

Si el equipo no fuera bueno no con el entrenador.

Which was most likely an effect on society that resulted from improvements in blood handling during world war i and world war ii?