Final answer:
The word part 'endo-' means 'within'. It is commonly used in medical and scientific terms.
Step-by-step explanation:
The word part endo- means within. It is a prefix that comes from the Greek language, and it is commonly used in medical and scientific terms. For example, endoskeleton refers to an internal skeleton, and endoscopy is a medical procedure to examine the inside of the body.
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