What steps are involved in the production of hydroelectric power?

a. falling water turns a turbine that generate electricity

b. moving water turns a paddle wheel that generate electricity

c. potential energy of after is directly transformed into electrical energy

d. water falls down a pipe to generate electricity

Option A

Explanation:

In the process of generating hydroelectricity , following process takes place

a) Water is retained through dam and is stored at high elevations

b) Water is then allowed to fall from great heights. In this process the potential energy  (attained due to storage of water at great heights) is transformed into another energy form i.e kinetic energy

c) In the next stage, kinetic energy of water is used to rotate the turbine blade.  

d) The turbine is connected to the motor which is placed between two magnets.  

e) As the rotor rotates between the two magnets, electricity is generated.

Hence, option A is correct

c.) polymerase chain reaction

- "unlike the original dna fingerprinting method, dna profiling does not use restriction enzymes to cut the dna. instead it uses the polymerase chain reaction (pcr)? to produce many copies of specific str sequences. pcr is an automated procedure that generates lots of copies of a specific sequence of dna."

the answer is cell division : )