Viruses are not made out of cells, they can't keep themselves in a stable state, they don't grow, and they can't make their own energy. Even though they definitely replicate and adapt to their environment, viruses are more like androids than real living organisms.
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
Light/Sun light. When planning on growing plants in your classroom the spot you're going to put them should be considered.
Hope this helps :\
The answer is photosynthesis. This is because plants take carbon dioxide from the air to make oxygen for us to breathe.
