A confounding variable refers to an external effect, which modifies the influence of an independent and dependent variable. This extraneous effect is used to affect the outcome of an experimental design. The confounding variables can ruin the experiment and can generate unnecessary outcomes.
In the given case, confounding variables can be introduced by testing multiple hypotheses at a time and by using distinct kinds of soil in each of the samples.
The answer is C. Cell wall is directly outside of the cell membrane.
Cell walls allow substances to pass through regularly but transport in and out of the cell is still regulated by the cell's membrane.
When your body run out of oxygen your muscle cell must produce some ATP using fermentation and glycolysis.
Answer:
A. Transpiration
Explanation:
Transpiration is the process of water evaporating from the leaves of plants through holes on the underside of the leaf.