Me if you know the answer, if you know the answer back it up with info. this is really important to me and it's due in 20 minutes,

Which of the following choices is not an effective solution to the energy waste related to inefficient lighting? a. using low-pressure sodium lighting sources b. pointing lights on billboards and street signs upward c. placing light sources on time controls d. shielding light to direct it downward

What are some possible short and long term medical concerns for crew members on longer space exploration trips

In the practice of science, this type of reasoning is used to develop explanations.