C. the answer is c. i just took this test on keystone (i think this is keystone question. right?0
Heat water using the sun during the day, and use it during the cold night.
Use a solar panel to charge batteries during the day, and use the power at night.
Ribosomes use amino acids to develop these proteins.
When converted to a household measurement, 9 kilograms is approximately equal to a
The number of protons in a neutral atom equals the number of ELECTRONS.
