A student set up four test tubes containing starch solution in which to perform starch digestion. Supplies include amylase and an incubator. Amylase is an enzyme present in humans and works best and standard body temperatures. In which tube listed would starch digestion proceed most quickly? A) Tube 3: Amylase present, when the temperature is freezing (0 c)
B) Tube 1: No amylase, room temperature (25 c)
C) Tube 2: No amylase, body temperature (37 c)
D) Tube 4: Amylase present, body temperature (37 c)

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Subduction zones form when an oceanic plate collides with another oceanic plate or continental plate. the continental crust is lighter and less dense than oceanic crust. continental crust's density is approximately 2.7 grams per cubic centimeter. oceanic crust is thinner and the average density is about 3.3 cubic centimeters. when the two crustal plates converge the oceanic plate always bends and subducts beneath a continental plate. once the oceanic crust subjects, the rocks are subjected to changes in heat and pressure. because of this, we would expect to find rocks in the area of a subduction. a) clastic b) igneous c) metamorphic d) sedimentary