Que pasaria si no existiera la magnetosfera?

The similarities of organisms in which two areas numbered above provide the best evidence for common ancestry between organisms in both locations?

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

Any sound above what db can cause hearing loss in human beings