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If you have a large oyster bed of 100 oysters, composed of 50 dark-colored (AA) and 50 medium-colored (aA) oysters, that population has 75 A alleles (75%) and 25 a alleles (25%).

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~ Presence of internal and external shell
~Unsegmented soft body with bilateral symmetry
~A mantle which is a fold in the body wall that lines the shell.
~ Numeral Mollusks live in freshwater and terrestrial habitats.
~Most have poor vision
~ Some have a well developed sense of shell that can help them locate food from a distance.

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Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Order: Octopoda
Family: Octopodidae
Genus: Octopus
Species: Octopus vulgaris

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External: Octopuses are bilaterally symmetrical with two eyes and a beak. The body is soft and can alter its shape to fit into small areas.
Internal: There is a lack of skeleton structure
Behavioral: Octopuses mouths are a sharp beak in order to grab and eat prey.
Habitat: Most live 300 ft deep in the ocean or at the bottom floor. Dens are a very important part of there habitat.

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Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Order: Sepioloida
Family: Sepiidae
Genus: Cuttlefish
Species: Linnaeus

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External: Have large W-shaped pupils, eight arms, two tentacles furnished with denticulated suckers.
Internal: produced ink and also has a neuro-toxin that can be used on prey and rivals.
Behavioral: Their mantle houses their cuttlebone, reproductive organs, and digestive organs.
Habitat: Temperate or tropical oceans, usually in shallow water.

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Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Order: Teuthoidea
Families: Loliginidae, Sepiolidae, and Architeuthidae.
Genus: Loligo
Species: Brevipenna

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External: Have eight legs in pairs, two with longer tentacles with suckers.
Internal: Squid have a distinct head, bilateral symmetry, a mantel and arms.
Behavioral: Can change colors to express there moods, some can produce there own light.
Habitat: Squid swim around the ocean at all different depths.

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Mollusks are coevolution because snail shells are a perfect example of the predator prey conflict which exist between mollusks and their prey. The shape smoothness and thickness of the shell has changed overtime as the predator of the shelled animal has evolved with stronger jaws and sharper teeth.

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Overtime mollusks left the sea floor and developed different ways of mobility such as propulsion which made them more difficult to be hunted by predators. Many mollusks lost their heavy shell such as the squid and gained a few feet such as the octopus.

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Natural Selection: There are over 100,00 species of mollusks. Many with, and many without shells. Overtime, some mollusks adapted to land, and gained shells for protection; while marine mollusks are without one.
Decent with modification has occurred within phylum mollusca because every species has some similar characteristics. This indicates that all mollusks once evolved from the same species. The Phylogenetic tree is a good example of mollusks evolving and branching off from the same species.

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Contains a shell, mantle, mantle cavity, visceral mass and foot.The shell is used for protection, while the mantle and mantle cavity hold the shell in place. The visceral mass contains digestive, reproductive, and circulatory organs; and the foot is used for movement.

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Genetic drift can occur when smaller populations of a larger population are separated due to geographic situations such as rock slides that isolate a smaller group of the larger group from each other. In the smaller group the percentage of A alleles to small a alleles could be different than the large populations percentage, and therefore over time could lead to a change in the evolution of the species.

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Squid

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Squid

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All organisms in class Phylum Mollusca start off their embryological development at protosomes. This means that when the gastrula is formed the opening becomes the mouth.

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The speciation is gradual, overtime the mollusks have become faster as a whole. This occurred in order to make it easier for them to hunt prey and to survive their predators.

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This image has 8 different species of mollusks chromosomes. They are all similar in size shape and number which shows that they all evolve from the same species.

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Hyoliths (Paleozoic Era)

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Rostroconchia (Cambrian Period)

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Octopus

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Kimberella (Ediacaran Period)

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Anadara (Cretaceous Period)

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Belemnitida (Maastrichtian Age)

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http://bivalves.teacherfriendlyguide.org/index.php?option=com_content&view=article&id=32&Itemid=125
http://shapeoflife.org/video/molluscs-survival-game
http://shapeoflife.org/video/molluscs-survival-game