Why is it often necessary to improve your design? O A. The engineering design process does not
really work
O B. The first prototype usually has problems.
O C. Most problems have no solution.
O D. You might brainstorm too much.

i think it is dna, i'm not totally sure but i think it might be.

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:

12