Before your food passes from the mouth and down your esophagus, salivary amylase, an enzyme in saliva, begins to digest the starch in your bread. That is the start of chemical digestion. ... The passage of the bolus through the esophagus to the stomach occurs by peristalsis, a series of wave-like muscle contractions.
Answer:
It has many functions, including delivering nutrients and oxygen. The four main components of blood are red blood cells, white blood cells, plasma, and platelets
In artificial selection, nature provided the variation, and human selected those variations that they found useful
Hello there,
<span>A "start" and "stop" codon is what determine's where on the DNA transcription begins and where is also end's.
I hope this helps you!
~Jurgen</span>
