Answer:
cells make up tissues, which make up organs. organs make up organ systems which make up organisms
Explanation:
C. testable and observable
The barnacles are only able to attach them selfs to surfaces in the water. Since the surface is limited, barnacles are attaching themselves to the other barnacles, crowding the rock. The muscles were not able to grow or attach themselves off the surface of the rock. Same thing with the mussels that are growing on the rock. So not only barnacles are crowding the rock, but Mussels as well are crowding the rock.
Answer:
Chemical energy changes into thermal energy and light energy
An open flame or burning flame
