B: nothing the color of the solution when heated
Answer:
I think <em><u>alpha</u></em> and <em><u>beta</u></em> is the answer.
<em>Transport of substances across cell membrane:</em>
<em>Carrier proteins facilitate transport of material across a membrane by changing its shape to allow a substance to pass through its membrane. It transports substances from high concentration to lower concentration levels.</em>
Its a form of anaesthesia used by dentists
hope that helsp
