The neurotransmitter involved in arousal, sleep, and mood is called:

Ronald wants to see if a new shower cleaner works better in removing soap than his old cleaner. he uses the new cleaner on one half of the shower tiles and his old cleaner on the other half. identify the independent and dependent variables in this experiment. enter your answer in the space provided.

Fredrick griffith made a scientific discovery in 1928

Are gametes exactly the same? explain why or why not?