Answer:
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THE BEST PH FOR ENZYME CATALASE IS 7
The variables are defined as the factors in an experiment, which are liable to change. The variable can be dependent or independent. The Independent variable is a variable, which is unaffected by the changes in the other variables.
In this case, the brand of the food Shara feeds to the rats is independent factor, but it is changes in the system, so, it is an independent variable.
The effect on the weight of the rat is dependent on the brand of food they are consuming. So, the weight of rats is dependent variable.
A chromosome is a Deoxyribonucleic acid molecule with part or all of the genetic material of an organism.
The answer is obviously not C as urine comes out of your urethra, so the answer is a and b
