Small molecules are able to pass through a cell membrane because the membrane itself is semipermeable. Larger molecules require the cell expend energy to transport the molecules across the cell membrane, usually by engulfing them.
Answer:
Its connective tissue I guess.
<em>An answer choice that is not an example of an organism responding to a stimulus would be;</em>
B) squinting your eyes when walking into bright sunlight
<u>Squinting your eyes in bright sunlight is an involuntary action, and does not require any kind of stimulus. </u>
