Potassium, 4 shells, 1 valence electron
Answer:
they have certain functions and or adaptations that allow them to move without spines
Explanation:
The correct answer is "reefs".
Shallow-marine environments are considered to be an area among the shore and deeper water, along with a reef wall or a shelf break. This surroundings is characterized by means of oceanic, geological and organic conditions, as described underneath.
I guess it is aluminium in cationic form
