The brain stem is central trunk of the brain, consisting of the medulla oblongata, pons, and midbrain, which continues down into the spinal cord.
A model organism is a species that has been widely studied to understand a particular biological phenomena, normally used because they are easy to breed and maintain in a laboratory setting and has certain experimental advantage.
The criteria that Thomas hunt Morgan was looking for include; the model organism should be small in size, easy to keep in the laboratory and also able to produce large number of off springs in a short time.
Answer:
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This hormone is known to regulate blood pressure.
To oxygenate your blood cells.
