16. brass is an alloy made up of
a. aluminium and zinc.
b. copper and tin
c. copper and zinc.
d. iron and carbon

C. Copper and zinc.

Explanation:

Brass is a alloy made up of copper and zinc with various proportions depending upon required properties. Generally brass is copper alloy. Because brass having copper as major quantity in composition, so metal is copper in brass, then it is called as copper alloy.

answer: the primary difference between a hypothesis and a theory is that b hypothesis is falsifiable, but a theory has been proven to be correct. theory is an explanation of something that is happening but hypothesis is a guess of something that can happen

explanation:

the answer to this question is 3.