Answer:
Is there and multiple choice options?
Explanation:
 
        
             
        
        
        
Answer:
Tentacles have specialised stinging cells called nematocysts. They use these to immobilise their prey so that the tentacles are then able to move the food into the mouth.
Explanation:
 
        
             
        
        
        
For giving you understanding ; we need Free O2 but Oxygen is also available in H20 right why dont we use it !! 
As the early atmosphere was reducing as there was no free oxygen but it was later produced by chemoautotrophic bacteria !! Living thing release O2 in atmosphere thus making it oxidising in nature and then life evolves !!
        
                    
             
        
        
        
Answer: SECONDARY CELL WALL.
Explanation: When cell wall grow,it becomes thickened,then it further deposits new layers of a different material (different from that of the primary cell wall) from where secondary cell wall is formed.
This secondary cell wall is made up of cellulose,hemicellulose,and lignin.
They function in providing additional strength,support, rigidity to cells and the larger plant.
 
        
                    
             
        
        
        
A building that grows plants on it and is tall and green