<span>The muscle at the end of the esophagus is not able to close, which allows stomach acid and digested food to go back up into the esophagus. </span>
Answer:
common ancestor
Explanation:
If it is a cladogram or phylogenic tree which is what it sounds like your describing, the connection is that all organisms share a common ancestor :)
Answer:
D, all of these are included in the biosphere
It is true I took the test please trust
