Answer:lack an epidermal covering, and their skeletons are composed of spicules of silica.
Explanation:
The spicules, which often form a latticework, have six points or some multiple thereof. Glass sponges are pale in color and are cup- or basket-shaped.
Answer:
I think c but I am not sure
Explanation:
Hopefully thus helps if it ain't right I'm sorry :(
Convection keeps the earths surface warm
Answer:
B,D,E
Explanation:
Analogous structures do not indicate a common ancestor. Analogous structures have the same function but a different structure. An example of an analogous structure is the wing of a bat and a butterfly.
3 examples would be touch, light and chemical.
and the most common signal would be chemical.
Hope this helps! (: