Somebody, please help me answer this question, I don't understand it and its due tomorrow.

A

Explanation:

The contents of the left side have moved down, this is able to be told because the "a" used to be in the same position all the way across. The left side moved down, and the right side moved up to create what is seen on the chart.

a boiling water reactor does not boil the water. a pressurized water reactor boils the water faster. a pressurized water reactor is heated directly by the core. a pressurized water reactor does not use fission.

in 1783 cavendish was working with his hydrogen gas and found that when he burned it and condensed the vapor it was water. this was very significant since it disproved the greek theory of elements completely since water was not a simple substance but the product of two gases. it was lavoisier who hearing of the experiment gave cavendish's gas the name hydrogen ("water-producer") and added that hydrogen burned by combining with oxygen and that water was a hydrogen-oxygen combination.

explanation: