A component of a circuit changes, as shown below.

At left a short horizontal line then a small circle with a line pointing up at about 45 degrees then a short gap then a small circle then a short horizontal line. In the middle an arrow pointing right. At right a short horizontal line then a small circle then a shorter horizontal line then a small circle then a short horizontal line.

How would this change affect the electric circuit?

A switch is closed, so the circuit would be incomplete and broken and the lights in the circuit would not shine.
A switch is closed, so the circuit would be complete and unbroken and the lights in the circuit would shine.
A switch is opened, so the circuit would be incomplete and broken and the lights in the circuit would not shine.
A switch is opened, so the circuit would be complete and unbroken and the lights in the circuit would shine.

"1. it should be, it has been for about 20 years, and it's really not much different in the end than breeding animals to have particular traits. there are always concerns about genetically engineered animals/plants affecting the environment in unexpected negative ways, but i can't think of an example where the fears didn't turn out to be baseless.  

first, as you point out, it would be a great advance in pharmacology, to be able to tailor drugs and their doses to me. the pros involve better medical treatment. the cons involve privacy issues like insurance companies denying coverage to people with genetic risk factors. looking at dna markers wouldn't affect the frequency of genetic diseases, but it would allow detection of them earlier. and ok, actually i suppose that if people used this information to avoid having children with genetic diseases, some might decrease in frequency."

the growth of the plants is affected by the heat of the light. what is the student doing?