True/false
Sometimes extinction can have a very large impact on an ecosystem. Such
important species are called keystone species.
True/false
Sometimes species are closely linked to another species. When one goes, the
other one that depended on it goes as well -w just like dominoes knocking each
other over. This is known as “domino extinction."

100 dollars because yeah

the sphincter muscles at the end of the digestive tract is the anus.

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: