Which best describes how scientists found the human gene that makes insulin? A. They worked backwards from mRNA to DNA.
B. They found insulin-producing genes in bacteria.
C. They used the base sequence to find the amino acid sequence.
D. They cloned insulin proteins using PCR

They used the base sequence to find the amino acid sequence

Explanation:

b. to discover aspects of the natural world.

hopefully i .

igneous rocks are formed by solidification of cooled magma (molten rock), with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks.  

the composition depends on the source magma. there are almost a thousand types of composition found till now.  

hope this