describe one effect of chemistry and one effect of physics in each of the following actions.
a. A birthday cake is made by heating a mixture of salt, flour, baking powder, sugar, and oil.
b. iron, not silver, is used to build the frame of a car.
c. a small wagon accelerates faster than a large pickup truck when the same force is applied to both.
d. sea otters can float in water on their backs while feeding.
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