As food reaches the end of the esophagus, it enters the stomach through a muscular valve called the lower esophageal sphincter. The stomach secretes acid and enzymes that digest food. Ridges of muscle tissue called rugae line the stomach. The stomach muscles contract periodically, churning food to enhance digestion.Mar 4, 2016
Question 3 is a scientific question because it can be experimented and answered by science.
Hope that helps!
Answer:
Shape, Size, Height, Type of Food
Explanation:
The color is the variable and the type of hummingbird can't be controlled.
The sun is at the center of our solar system but it is not the center of our universe
Answer:
i think this will help im not 100% sure though
https://www.isd2135.k12.mn.us/cms/lib/MN01001544/Centricity/Domain/54/Chapter%207.1%20Guided%20Reading%20Key.pdf
