Question

1. ___observation is made using one or more of the five senses.

2. An independent variable is a variable that's___changed in an experiment.
3. An explanation based on an observation is a a/an ___
4. There may be only one___variable in an experiment.
5. ___observation is made using tools or measurement.
6. What's the difference between an observation and inference?

Answer 1

The observers is based only on an experiment