Final answer:
Telemetry, in the context of the robot on Mars, is used to collect data and send it to scientists on Earth.
Step-by-step explanation:
The purpose of telemetry in the context of the robot on Mars is to collect data and send it to scientists on Earth (option 3).
Telemetry refers to the process of collecting and transmitting data from remote or inaccessible locations. In this case, the robot on Mars uses telemetry to gather information about the land and atmosphere of Mars, and then it sends this data back to scientists on Earth for analysis and further study.
By using telemetry, scientists can learn more about the Martian environment, including its geological features, climate, and the potential history of water on the planet. This information is crucial for understanding Mars and its potential habitability.