What is an observesation?

Why are zero degrees and a hundred degrees important in the Celsius scale? Do cactus have deep roots? What is the process of a substance giving off energy through electromagnetic waves? What objects can be measured in kilometers? Which type of bonding includes the sharing of electrons? What is the meaning of probe tools in science? Of all the rivers in the world which contains the most water? What does a burglar alarm sense? Can you use familiar acclimation in a sentence? Four groups of mice consume different amounts of sweetener in their food The control group is the one that receives? What historical event starts with the letter J? Use the word second in a sentence? Does scientist use English units of measurement? What does 38.7 degrees Celsius equal in Fahrenheit? What one factor should you plan to change as you carry out your investigation? When an object is being squashed it is said to be in? How can you reuse a similac baby formula container for something else for an earth day project? How would environmental changes most likely affect floweing plant seed production? Why was the glow stick invented? What does the visual cliff experiment demonstrate?