2 and 3 please HELP!!

Which equation is used to calculate the magnetic force on a charge moving in a magnetic field

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

Gene expression is the activation of a gent that results in a question 1 options: protein dna mitochondria