it's better to have a control but no you do not have to have a control in a science fair project
We Is Doing A Project On Control Variables.
Control in a science experiment means it stays the same and you don't do anything to it.
An observation from a science experiment.
How to make a science Biome Project How to make a science Biome Project
the question of your science project
The variable is the characteristic being changed while the control is left as is to see what would normally happen.
A control in a science fair project would usually be a separate running of the experiment where you don't change anything. Example: If you are testing the effect that music has on plant growth, you would grow a plant with no music.
it is a variable that you allow to stay the same throughout the experiment.
what is interview for a science fair project
our science project bruv
life science