Answer:
Once you begin swallowing, the process becomes automatic. Your brain signals the muscles of the esophagus and peristalsis begins. Lower esophageal sphincter. When food reaches the end of your esophagus, a ringlike muscle—called the lower esophageal sphincter —relaxes and lets food pass into your stomach.
<span>radioactive zone & convection zone i think
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A. a tree
you can first eliminate B. and C. to make it easier to choose an answer. then you can eliminate a generator because it would turn mechanical energy into electrical energy. a tree uses photosynthesis to convert light energy into chemical energy, using the sun as a source for the light energy and turning it into food (chemical energy)
The answer is 4NH3+502<span>→4NO+6H20. I hope this helps</span>
