This is the normal nucleotide sequence on a dna strand:
a—c—t—g—g—a—t

what is a substitution?

1.) a—c—t—g—c—g—a—t

2.) a—c—t—g—a—t

3.) a—g—t—g—g—a—t

4.) a—c—u—g—g—a—u

answer

the ions in solute supperate from eachouthere

the correct option is c.

isotopes refers to different forms of the same element with the same atomic number but different mass number as a result of difference in their neutron numbers. isotopes have different relative atomic mass but share the same chemical properties.