Final answer:
A large medulla indicates that a hair is more likely to be from an animal rather than a human.
Step-by-step explanation:
The presence of a large medulla indicates that a hair is more likely to be from an animal rather than a human. The medulla is the central core of the hair shaft and is present in many animal hairs, but is usually absent or very small in human hairs. A transparent cuticle, short root, or large cortex do not necessarily indicate whether a hair is from an animal or a human.