Roughly, how many mutation occur every time one of our cells divide

What does resonance result in? quieter sounds frequency amplitude louder sounds

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

18. which statement about cancer is true?