Calcium ion is responsible for Muscle Contractions.
Answer:
The color of the birdfeeders
Explanation:
Independent variable is the variable in the experiment that is changed, so the only thing changed in this experiment is the colors of the bird feeders
Answer:
B--- pay careful attention to what you are observing.
Explanation:
When you go to fast when making observations, you can mess up. When you take your time and pay careful attention when making observations, there is a chance you could mess up, but it is very slim.
