How many types of cancer have been identified through research? a.50c.200b.100d.500

Which phrase is the best summary of the model shown? a. the transfer of the sun's energy through trophic levels b. a series of aerobic and anaerobic reactions c. a transformation of light energy into chemical energy d. the breakdown of food molecules

In the water cycle , when does water undergo a chemical change

I’m stuck on this question cuz i’m stupid sksksksk