What is released when an excited electron returns to a lower energy state?
an isotope
a proton
electricity
electromagnetic radiation

Witch type of microscope is used to view very small cell components like proteins and dna?

Ronald wants to see if a new shower cleaner works better in removing soap than his old cleaner. he uses the new cleaner on one half of the shower tiles and his old cleaner on the other half. identify the independent and dependent variables in this experiment. enter your answer in the space provided.

Mineral rich water heated by newly found oceanic crust escapes through cracks in the ocean floor called