Inferences cant be the answer because inference is the reason of why the observation happens
I think the correct answer is C. An investigation is a type of research that involves observation and collection of data but it does not include a control. In an investigation, all data and information that is related to the subject matter are collected it does not think of any factors that may affect the subject.
Aerobic is with oxygen and anaerobic is without oxygen.
Aerobic does not include lactic acid, while anaerobic includes lactic acid.
Answer & Explanation:
There are often not more than one or two independent variables tested in an experiment, otherwise it is difficult to determine the influence of each upon the final results. There may be several dependent variables, because manipulating the independent variable can influence many different things.
