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Most animals I see around seem to have two nostrils - humans,snakes, birds, fish .. and so on. From reading online I see that 2nostrils provide a stereo olfactory effect. This stereo effect iscaused by the difference in flow of air through the nostrils.
Does this stereo effect apply only to humans? Are there anyanimals that have a different number of nostrils? Say, more than 2,or less.
Explain how the structure and function are linked together for the following organs of the digestive system:
1) Mouth
2) Oesophagus
3) Stomach
4) Small intestine
5)Large intestine
6)Rectum
7) Anuss
1. Describe how the muscularis externa varies among the esophagus, stomach, small intestine, and large intestine. List any features of this layer that are unique to each part of the GI tract.
2. List two ways in which the layers of the esophagus differ from that of the stomach and intestines.