A dependent variable is how they are recording, measuring or keeping track of the science experiment their doing.
A independent variable is the things/types there using to compare what is the most/least affective in the experiment.
A controlled variable is something that stays the same in the experiment or a group/set used for comparison
Answer:
c. Hydrogen
Explanation:
Do I really need to explain...
Teperature
Ph level
Substrate concentration
Not sure if these are physical but hope it helped.
The correct answer is hypertonic
Answer:
B. Bacteria are introduced to break down hydrocarbons in an oil spill.
