C, to make sure the design works as expected.
A prototype is first, typical model of the said product. Hope this helps!
Answer:
They are found in South America and African Plates. Earths outer layer is made out of solid rock. These fossils are sometimes discovered closer to the mantle; the mantle is between the crust and the earths super-heated core!
Explanation:
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Al (+3)
NO3 (-1)
So basically you need 3 NO3 and one Al to produce Al (NO3)3
we can do soo by noticing any colour change, or by the formation of an insoluble precipitate or by the evolution of a gas.