Answer:
A laboratory rat or lab rat is a brown rat of the subspecies Rattus norvegicus domestica which is bred and kept for scientific research. While less commonly used for research than mice, rats have served as an important animal model for research in psychology and biomedical science.
Electrons: Negative charge
Protons: Positive charge
Neutrons: No charge
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<span>In a rat's digestive system mechanical digestion occurs in the mouth, stomach. Chemical digestion occurs at three points, which are: In the mouth starch is partially digested, in the stomach proteins are digested, and in the small intestine the rest of the food (but not fiber) is digested.</span>
