2. What is used in order to make an observation?

A scientist looking at a chemical reaction in an experiment
A doctor watching a patient after administering an injection
An astronomer looking at the night sky and recording data regarding the movement and brightness of the objects he sees
A zoologist watching lions in a den after prey is introduced to determine the swiftness of the animals' response
Air flight controllers watching their monitors for airplane movements and locations
A meteorologist watching the Doppler radar as a storm approaches
A botanist recording daily data on plant growth after looking and measuring each day
A chart showing data collected over time
A doctor watching a patient's reaction to a medication