Answer:
electromagnetic waves can travel in a vacuum
Explanation:
I'm pretty sure it would be A.
The answer should be A.
The control variable is the experimental variable that remains unchanged throughout the experiment. Alice did change the angles where the light from the ray box struck the mirror and where the mirror reflected the light. She also changed the direction, but she never really changed the ray box.
The type of protein that plays an important role in transmitting signals in the nervous system is : A. Ion channel membrane proteins
The opening and closing of ion channel membrane proteins leads to changes in membrane potential which conducts information over an axon or synapses
hope this helps
