You can see how old people are
        
             
        
        
        
Answer: urea disposal
Explanation:
<u>The liver, which is the largest organ in the human body, performs three vital functions of the organism: detoxification, synthesis and storage. </u>
The liver acts as an authentic filter that collects and eliminates numerous toxins, such as ammonia, or toxins that we ingest, such as alcohol (it performs a biotransformation of toxins). Our liver is also responsible for the metabolism of carbohydrates, lipids and proteins, secreting bile, an essential element for the digestion. It also prevents bleeding through a coagulation process. And it is a container of vitamins (A, D, E, K) and glycogen (carbohydrates), while energy is stored in the form of sugar, made available to our organization. 
The urea cycle takes place primarily in the liver. Organisms convert ammonia to a less toxic substance, such as urea, via the urea cycle. <u>Then it is released into the bloodstream where it travels to the kidneys and is ultimately excreted in urine. </u>
So, the liver is involved in the production of urea, but the kidney is responsible of its disposal.
 
        
             
        
        
        
Answer:
Option D, Five radish plants are grown in sunlight, while another five radish plants are kept in the dark.
Explanation:
In a controlled experiment, impact of one independent variable is studied on the dependent variable.  
Here in this study sunlight is the independent variable while the radish plant is dependent variable.  
The researcher wants to study the effect of sunlight on radish plants when they are exposed to it   and compare it to the effect created on radish plants  that are kept in dark.  
Hence option D is correct.
 
        
                    
             
        
        
        
Answer:
Also know as the <u>skeletal</u> nervous system. The part of the <u>peripheral</u> nervous system that controls the glands and the muscles of the internal organs (such as the heart).
 
        
                    
             
        
        
        
Answer:
Cell membrane
Explanation:
The cell membrane is a flexible and permeable skin surrounding a cell.