Answer:
Most liquids become monotonically denser when cooled from room temperature, but liquid water reaches its maximum density at approximately 4°C, below which it expands to become less dense as it is cooled further. To explain this density anomaly, several ideas have been proposed.
Explanation:
 
        
             
        
        
        
Answer:
I started out as glucose, got converted to pyruvate, after which I got oxidised by Oxygen to become CO2
Explanation:
My name is CO2, and I started out as glucose from pure honey. I got eaten by a little child when I was two weeks old, and I had to go through the dreadful process of aerobic respiration in the child's body.
My glucose molecules were broken down into pyruvate, and I stayed that way  for a while, as I made my way to the mitochondria of the child's cells.  Once I got to the mitochondria, I met my old friend oxygen, who reacted with me to turn me into the molecule I am today - C02. 
If you want to know how I escaped the child's body, that's easy - I simply snuck out his nose while he was breathing one cold dark night.
 
        
             
        
        
        
Its B.cell wall
ribosomes are used to synthesis proteins and other components required for cells 
endoplamsic reticulum is where the ribosomes are its a structure that helps to prepare the components and to bring them to the golgi body 
the cell wall is only present in plants (cellulose) and fungi (chitin) and it helps plants to regulate their water intake physically
the cytoplasmis present in all cells as the medium which organelles are suspended in and in contact with
hope that helps <span />