Hey There!
Here is your answer:
Your answer is that a experiments should be controlled because the experiment could go out of control which could harm or hurt someone.
Also the definition of a controlled experiment is a part of the experiment that's not touched.
Ex: Water is your controlled experiment that's because our not doing anything to the water.
If you need anymore help just ask me!
Hope this helps!
Answer:
last answer. Breaks down sugar before respiration can begin. Glycolysis breaks down glucose. glucose=sugar
Systolic pressure is when the ventricles contract.
Answer:the phloem transports food and nutrient
Explanation:
