Identify 2 unique adaptations made by all animals in the phylum mollusca, the function of each adaptation, and your theory as to what pressures may have forced each adaptation and identify 2 unique adaptations made by all animals in the class bivalvia, the function of each adaptation, and your theory as to what pressures may have forced each adaptation.

and you!

2 unique adaptations made by all animals in the Phylum Mollusca are:
1) the Radula - it is a tongue-like plate that is used for diverse feeding methods. 
2) a well developed, muscular foot - used for clinging to surfaces, burrowing, anchoring in sediment, locomotion, swimming, modified into prehensile tentacles in octopus.

 2 unique adaptations made by all animals in Class Bivalvia
1) ctenidia - term used to identify its  gills which were  adapted for filter feeding
2) siphon - a modification of mantle tissue found inside the shell. It flushes water through the mantle and aids in the respiration, circulation, and waste removal of the organism.

Your pictures are upside down