Animal Behavior College Externship Practice Test 2026 – Complete Prep Tool

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What does the root thromb(o) refer to?

To clot

Thromb(o) designates a clot. This combining form is used in terms like thrombosis (the formation of a blood clot inside a vessel) and thrombus (the clot itself). So the meaning “to clot” is the correct fit. The other options point to different roots: birth relates to toc- or nat-, chest to thorac-, and heat to therm- (or calor-).

To give birth

Chest

Heat

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