How are the mutations in a genome similar to printing a book?

a) every letter in a book resembles the mutations in the genome.
b) errors that appear in one copy can be copied to all other copies of the book.
c) like printing errors, mutations always negatively affect the final product.
d)just as a single book is printed at a time, a single mutation is read at a time.

Its B) Errors that appear in one copy can be copied to all other copies of the book.

Explanation:

Mutations are change at the gene level which happens sometimes during the duplication of DNA. The repair mechanism in our body usually corrects the error but if it fails then the mutated gene remains. These mutated gene results in altered protein which can be either useful or harmful. Mutations are not necessarily harmful. For example in African population mutation resulting in sickle cell RBC protects them from malaria. Mutations in bacteria help them to survive against the action of antibiotics. This results in the formation of antibiotic resistant strains of bacteria.

Some mutations are called silent or neutral mutations because it shows neither positive nor negative effect on the organism.

Mutations can also lead to cancer specifically when the tumor suppressor genes are mutated in our body.  

the correct answer is 4) heat and pressure

metamorphic rocks arise from transformation of existing rocks types, in a process called metamorphism. during metamorphism the original rock(prolith) change into metamorphic rock by heating (150-200c) and pressure of more than 1000 bar. the original rock can be sedimentary, igneous, or existing metamorphic rock.