molecules will gain energy, causing them to move faster and spread further from each other
 
        
             
        
        
        
The answer is skin. The skin is also the largest organ in the body and has the most contact with the outside environment. It is estimated that there are approximately 205 identified genera of bacteria alone on the skin. This normal flora of the skin play significant roles in the body such as augmenting immunity. 
 
        
             
        
        
        
Answer:
Explanation:
During cellular respiration animal cells combine oxygen with food molecules to release energy to live and function. Remember that cellular respiration produces carbon dioxide as a waste product. Animals use energy to grow, reproduce, and to function. They release the carbon dioxide into the air as a waste product
 
        
             
        
        
        
Answer:
These are the thylakoids
Explanation:
The thylakoids which contains the chlorophyll is  the primary site of photosynthesis. It  is covered by layers of cell called the thylakoid membrane.These are the actual site for light dependent reaction.This membrane contains both photosytem I and ii, ATPase enzymes, and Cytochrome b6f complex.While the photosystem i and ii transfer elecrons during photosynthesis, the ATPase enzyme control the catalysis the phosphorylation of ADP to ATP needed for the light independent stage, the Cytochrome  proteins  acts as the ETC. involved in the transfer of electron during light dependent stage.
When thylakoids are packed together in disc shape they are refer to as Grana,(singular -granum).Each  grana are linked together by intergrana.Thus two or more grana are linked by intragrana to form a single photosynthetic functioning unit.The entire structure is bath continuously by the fluid medium-Stroma.
Their stacked and  disc shape is to increase the surface area available to accommodate enough  ETC, needed to transport electron for chemiosmosis needed for photosynthesis.