They are the chemical symbol like the ones on the periodic table
The removal of excess wastes helps in maintaining chemical homeostasis and prevents breaking down of systems that causes a serious health issue.
<u>Explanation:</u>
Human body is composed of many different organ system that are inter related with each other's functions. If the function of one system is disturbed then the function of other system also gets affected resulting in affecting the entire human body functions. The system that is used to remove the excess wastes and unwanted things from the human body is an excretory system. It performs tow major function in a human body. It removes unwanted things and it also helps in draining the broken down components.
The excretory system helps in the control of internal chemical homeostasis. When a living organism's physical and chemical conditions are maintained steadily it is called as homeostasis. This system also helps in maintaining the human systems in a controlled and good condition thereby preventing the failure of other systems and serious health damages.
Answer: A) a chemical change is required to seperate the elemnts present in it
Explanation:
Water is a compound, since it is the result of combining atoms: hydrogen 
and oxigen 
. In fact, the chemical formula of water is 
.
On the other hand, chemically in a compound the atoms must be combined in a fixed ratio by mass. In the case of the water molecule, the ratio is 2:1 (For each oxigen atom there are two hydrogen atoms).
So, if we want to separate the atoms that make up the water molecule, it only will be possible by a chemical change and not by a physical one.
Hence the correct option is A.
