What is an astronomical unit? a. the average distance between planets in the solar system b. the average distance between the earth and the moon c. the approximate diameter of the sun including its atmosphere d. the average distance between the earth and the sun

D. The average distance between the Earth and the Sun.

Explanation:

just looked it up.

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:

multiple allele inheritance is traits controlled by more than 2 alleles (ex: pigeons having 3 alleles of one gene govern their feather color).   so the answer is a.