Nomadic people like mongols, huns, and khitans
Answer:
1. Taking care of these systems would ensure smooth cellular metabolism.
2. It would reduce the risk of heart diseases.
3. It would help in the maintenance of the right pH for the blood.
4. It would allow for the easy removal of the waste products from the body.
Explanation:
The respiratory system refers to the series of processes that begin with the inhalation of air and its movement across the blood vessels and eventual discharge from the body. Oxygen which is a very important gas needed to sustain life is inhaled during respiration. It is also circulated through the circulatory system to the cells and tissues that need it.
Taking care of these systems through exercise, rest, and eating the right foods will protect us from diseases that affect them such as Heart attack. Cells would also function well and not die easily because they can access the oxygen needed for them to thrive. The right balance of these gases would also ensure that the proper pH of the body is being maintained.
The insurgency elements that a<span>re active sympathizers who provide important support services but do not participate in combat operations is: </span><span>Auxiliary
Within a combat operation, there is always be a group of individuals that exist in battlefield without any intention to fight for both groups.
One example of this is the Red Cross.
In every combat, The Red Cross will provide medical assistance to any participants that are injured in the battlefield without seeing which side those participants are in. It is a very common norm in a battlefield that members of the red cross should not be attacked under any circumstances.</span>
Answer: 3) Confounding variable
Explanation:Confounding variable is the variable that indicates about the external influential factors that produces the manipulated consequences of independent and dependent variable.This variable can lead to producing useless outcomes in an experiment.
According to the question, the changes occurring in interest of student in algebra can be due to the outside factors which are not generating the actual results and thus, experiment is getting ruined.
Other options are incorrect because application variable remain same for the experiment,system variable are the variables of certain system and reliability variables describe about the variable on which dependent or stable.Thus, the correct option is option(3)
