Answer:
Proteins can be catalysts which help to reduce the energy used in a chemical reaction or speed it up. Proteins can help carry oxygen throughout the body in the form of hemoglobin 
Explanation:
 
        
             
        
        
        
Answer:
Explanation: Sponges are animals with dense skeletons that are highly adapted to their environments.
 
        
             
        
        
        
They are more similar then different. Animal and plant cells have some of the same cell components in common including a nucleus, Golgi complex, endoplasmic reticulum, ribosomes, mitochondria, peroxisomes, cytoskeleton, and cell (plasma) membrane. The main difference is that plant cells have a cell wall while animal cells only have a cell membrane. In addition, plant cells preform photosynthesis, while animal cells preform cellular respiration. 
Hope this helps!
 
        
             
        
        
        
1 is the answer because it’s talking about chemical
        
             
        
        
        
Answer:
The “recommended temperature limit” indicates limit of the temperature that is good for our world and above this limit causes adverse affect.
Explanation:
The temperature related to the “recommended temperature limit” means that in the graph there is a limit of temperature for our world's environment. if the temperature is between this limit, there is less or no adverse effect on our environment while on the hand, if the temperature exceeds from this limit, then it adversely affected our world because the concentration of carbondioxide gas in the atmosphere increases due to this increase temperature..