The first line is MORE dense
Second line forming a PLATE.
Because of the moons gravitational pull, is strong enough to pull the ocean around... I hope that helps!
<span>Bivalvia - Clams, Oysters, Scallops and Mussels.
Cephalopod - Octopi, Squids, Cuttlefish, and the Chambered Nautilus.
Gastropoda - Snails and Slugs.
<span> Polyplacophora - Chitons.</span></span>
