Final answer:
The sentences can be completed as: 'Anthropologists are scientists who study human cultures', 'Wild pandas are animals that live in the mountains of China', and 'A globetrotter is someone who travels to many countries'. The first and third sentences can be written with either 'who' or 'that', while the second is best with 'that'.
Step-by-step explanation:
Completing each sentence with a who or that clause using the words in parentheses can help to specify the subjects we are discussing. Here are the sentences completed with the appropriate clauses:
- Anthropologists are scientists who study human cultures.
- Wild pandas are animals that live in the mountains of China.
- A globetrotter is someone who travels to many countries.
The sentences about anthropologists and globetrotters can be written with either who or that, as these pronouns are interchangeable when referring to people. However, the sentence about pandas is best written with that, since who is typically used for people, not animals. Therefore, there is more flexibility with the first and third sentences than with the second one.