Why did the cephalopod loose its shell? explain two (2) possible evolutionary reasons. briefly discuss the four (4) unifying features of mollusks and explain one major difference between mollusks and worms. how do octopus and squids change color? briefly explain the cause and effect. why do some creatures have weird and bright colors like the pink slug? briefly describe the five (5) major requirements of corals. are they "tourists? " briefly explain the mating ritual of octopus as described in the science articles and lecture slides.

Mantle convection is the process that drives plate tectonics. the theory of plate tectonics states that the crust is divided into plates that float on the semi molten mantle below. the circular motion of the magma as it slowly rises and falls or move though convection cells drags the plates along causing them to move. the heat source in the lamp would represent the earth's core. the core is the source of energy that drives convection in the mantle. the lava represents molten magma under the earth's surface. if the lava lamp had floating pieces they would move as the circular motion of the lava in the lamp as it rises and falls would move them along the surface. these floating pieces would represent pieces of the earth's crust. 

Except common history

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