The earth’s core is made of an alloy of
a. iron and nickel.
b. copper and iron.
c. zinc and magnesium.
d. iron and zinc.

The correct answer is iron and nickel.

Earth's core is the hottest and deepest layer. It is made of two layers The outer core which forms the border of mantle and inner core is spherical ball which is made up of metal. The outer core is about 1400 miles thick and it is made up of combination of alloys (iron and nickel). Some other metals are also found there in trace amounts like uranium, platinum and gold.In the outer core these metals are found in solid form.

an organism's phenotype is the  form of a trait  that it  displays. for  flowercolor, a pea  plant  can  display  a phenotype of purple or white flowers. an organism's  genotype  is the alleles of a gene it contains. based on his data, mendel concluded that a phenotype can be  determined  by more than one  genotype.

did you fail the test? xd