What process do scientists use to answer questions about the world; for example, redi's experiment with rotting meat?

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

Do you think the gene eef1 alpha1 supports cell theory? explain your response.

Crossing over and independent assortment are important activities that occur during meiosis. what is the significance of these activities