Answer:
1-A ring-shaped muscle that relaxes or tightens to open or close a passage or opening in the body.
2-Sphincters are specialized muscles that are located at the upper esophagus (upper esophageal sphincter (UES) and the gastroesophageal junction
Explanation:
I'm almost sure your answer is going to be "Because the sun's mass creates a gravitational force that pulls earth towards it."
correct me if I am wrong.
Ernest Rutherford
Ese
Density--1.0g/cm3
Gravity-- 2.65g/cm3
brainly.com/question/9895615#citedsource
<em><u></u></em>
