Is gneiss a fracture or cleavage?

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

What causes darkening of the skin as melanin production increases

You see a white marker with an orange circle and black lettering. what does this marker tell you