When in a certain situation, organisms with traits more suited to survive in that situation often survive more often and are able to reproduce more, which means that their genes eventually dominate the gene pool.
For example: take a light moth population and a dark moth population. They live in a forest with dark trees, so the dark moths blend in more and are harder to find and hunt. As a result, more of them survive than the light moths, so more of them are reproducing and passing their genes along.
Over time, those genes may become the only traits of that variety that the organism can have, so they grow to evolve and adapt to their surroundings.
Answer:
The thin external covering is similar to the Cell Membrane. The organelle with a texture like sandpaper is the rough endoplasmic reticulum (ER)
Hi the answer to your question would be the signals may be transmitted by Integrins.
Hope this helps.
Muscles.
your tissue is attached to a dermis which is basically your muscle and bone so muscles is the answer