double  stranded  molecule does  not  describe the  structure  of RNA. Most  RNA  are  single  stranded  with  partial  double  stranded  regions.  RNA  has  basic   component  as  the  DNA  that  is have  four  nitrogenous  base,  contain  phosphate  group  and  have  5  carbon sugar.
        
                    
             
        
        
        
Answer:
D) Ciliated simple columnar epithelium
 
        
             
        
        
        
Answer:
The three basic items to make an electromagnet are a source of current, conducting wire, and a metallic core. Electromagnetic is a type of magnet which is formed with the help of electricity. 
When the current is allowed to pass through the wire and the metallic core, the magnetic field is generated around the metallic core and when the current is turned off, the metallic core losses the property of magnetism. 
 
        
                    
             
        
        
        
<u>Answer:</u>
The<u> Lead </u>toxicity can result in slow growth and iron-deficiency anemia, and can damage the brain and central nervous system.
<u>Explanation:</u>
Lead poisoning is a form of metal poisoning in the body which is triggered by lead. The most prone of these is the brain. Signs can be abdominal pain, indigestion, fatigue, irritability, problems with memory, failure to have children and numbness in the hands and feet.
It triggers nearly 10 per cent of quite unknown cause's intellectual disability and can lead to behavioral problems. A few of the consequences are irreversible. In extreme cases there may be  coma, anemia, seizures or death.
 
        
             
        
        
        
Answer:
biotic things r living and abiotic are not living
Explanation: