Assertion (A): Observations made with our senses alone are always exact, so scientists never need measuring instruments. Reason (R): Instruments such as thermometers and measuring cylinders help scientists make more accurate observations.

Question

Assertion-ReasonObservation and Questioning in Science

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Which of the following is an observation and not a guess or inference?

What is the difference between an observation and an inference? Give one example of each about a puddle of water that dried up on a sunny day.