a control helps to increase the reliability of the results. it allows a scientist to compare it to other group(s) in an experiment. if a scientist notices a significant different btwn the control and the other groups, he can logically conclude that the independent variable has an impact on the dependent variable.
a variable is any factor, trait or condition that can exist in differing amounts or types. there are usually three tpes of variables in experiments: the independent, dependent and contolled. the independent variable variable is the one that is changed by the scientists to figure it's affect on something.
Answer:
either the first one lactic acid fermentation or the third one alcoholic fermentation
1. Interstitial fluid directly influences the proper functioning of cells.
2. Effector refers to the structure of a feedback system, which gets output from the control center.
3. Receptor refers to the structure of the feedback system, which donates input to the control center.
4. Childbirth refers to the condition not regulated by a negative feedback loop.
5. Sign refers to the change in the function of the body, which can be determined objectively.
6. The cranial cavity refers to the large, bean configured cavity occupying the majority of the upper skull where the brain is situated.
7. The thoracic cavity compries of the lungs and is located in the mediastinum.
8. The abdominal cavity is the region where stomach is located.
10. The pericardial cavity comprises the heart.
I have some doubt in Question no 9.
