Which recent discovery led to a new understanding of how genetic mutations increase the risk of cancer?

Ageologist determines that a sample of a mineral cant be scratched by a steel nail but can be scratched by a masonry drill bit based on this information the sample mineral has to be softer than

Study the diagram of a cell. which structure is found only in plant cells and functions in the process of photosynthesis? w x y z

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