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:
That would be. All of the above.
k
The part of the plant that takes in carbon dioxide from the air for photosynthesis stomata.
120N
F=ma
120N=6kg(20m/s^2)
