The answer is oxygen
hope it helps!
An experiment is a process where the a scientist tests and draws their evidence and data from. Hence, this process is where the hypothesis be supported or negated.
Variables are traits, factors, or characteristics that either manipulated or measured being the subject to become the data.
The independent variable is B.
<span>the presence of the new antibiotic</span>
The immune system is the bodies defense against invaders and is located in all body tissues with concentration in the mucosal surfaces and skin.
