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Explain the depth-perception illusion pictured in figure 3.1.Why does it appear that a large creature is chasing a small creature?
Pathogens
microorganisms that cause diseases in their hosts.
Foreign Substance
Any material or substance that is not naturally part of an object or body and may be harmful or benign.
Disease-causing Agent
An organism or substance that is capable of producing disease, such as bacteria, viruses, or toxins.
Lymphatic Vessels
A network of thin tubes that transport lymph, a fluid containing infection-fighting white blood cells, throughout the body.
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