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

select one:
a.
a—c—t—g—c—g—a—t

b. a—c—t—g—a—t
c. a—g—t—g—g—a—t
d. a—c—u—g—g—a—u

the pic attached shows the stages of mitosis. hope it !

answer: although many types of viruses can cause a common cold, rhinoviruses are the most common culprit. a cold virus enters your body through your mouth, eyes or nose. the virus can spread through droplets in the air when someone who is sick coughs, sneezes or talks. theres your answer

explanation: