The male red-winged blackbird has a bright-red patch on its shoulder. this adaptation increases its chances of mating with the female blackbird. some of the birds underwent mutation, and their offspring didn't have the red-colored patch.

it increases the variaty but the birds without the red patch have a lower chance of mating.

Explanation:

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: