The answer to this question would be labile.
A permanent cell is the one that will not divide after fully developed. This includes the heart and brain cells. That is why when these organs damaged there will be a permanent loss of function. 
Stable cell only divides in some occasion. The example would be liver cells or kidney cells.
        
             
        
        
        
A. can cats learn to sit down on command
        
             
        
        
        
Answer:
The answer is B lower pressure
Explanation:
because in cooler places its cold and warm mixed
 
        
                    
             
        
        
        
Answer:
Oxygen
Explanation:
Oxygen is the by product of photolysis during photosynthesis whereby water molecules are split to form protons (H+ ions), electrons and oxygen (by product). 
Oxygen is not needed during any of the reactions in photosynthesis and Calvin cycle and will not affect the rate of photosynthesis or possibility of photosynthesis occurring. However, it will affect the process of aerobic respiration instead. 
Carbon dioxide is needed in carbon fixation during the Calvin cycle. Without it, 6 carbon sugars cannot be formed. 
Water is needed for photolysis to produce protons (maintain the electrochemical gradient) and electrons (to replenish lost electrons)
Chlorophyll are pigments that harvest light energy to excite electrons produced from photolysis of water to be passed down the electron transport chain. 
Light is needed as a source of energy to energise the electrons
 
        
             
        
        
        
The green house effect is a natural process that warms the Earth surface.
((Carbon dioxide))