This is only one part of the answer, but its important: high-altitude O2 absorbs much energy from the sun (including radioactivity), which forms the ozone layer. this process protects delicate molecules important to life - most notably dna
        
             
        
        
        
Answer:
Snake venom involves enzymes, proteins and substances with a cytotoxic, neurotoxic effect and coagulants. 
Explanation:
Snake venom is very deadly because of the enzymes it contains. For example, Snake venom hinders cholinesterase which causes loss of muscle control.
 
        
                    
             
        
        
        
Answer:
In a chemical reaction, the atoms and molecules that interact with each other are called reactants. In a chemical reaction, the atoms and molecules produced by the reaction are called products.
 
        
             
        
        
        
I think it’s true but I could be wrong