Types of water to dissolve an effervescent tablet: Tap water
Warm water
Cold water
Salt water
Acidic water (using vinegar)
A control group in an experiment is the group that is not receiving a new or manipulated variable. The control group receives what is normal.

Which type of water is our control group (not controlled variables)?

As scientists have investigated evolution from a variety of fields, they have found that some of darwin's orginal ideas were inaccurate or incomplete. t explanation provided by evolution was updated each time to reflect the new information they found. what does this suggest about the theory of evolution? it has become a stronger and clearer theory as new information is collected.