1.a noble gas in period 2 2.an element that does not belong to any family
3.a transition metal in period 5
4.a halogen
5.an alkaline carth metal
6.a metalloid in period 3
7.an alkali mctal in period 4
8.a nonmetal in group 5A
9.a metal in period 7
10.a metalloid in group 5A

Most likely a is the answer - because  you generate   38 atp's but also consume an atp.   each atp gives approx. less than 4 kcal so probably a is the closest answer.

Firstly, the water in the dams hold gravitational potential energy as they are above ground level. the gravitational potential energy is then transferred to kinetic energy as it falls, spinning the turbinethe turbine then spins the generator, which is a large magnet surrounded by metal coils. by doing this, the generator generates electricity. in this action, the energy transfer taken place is kinetic to electric energy