Answer:
Adrenaline
Explanation:
The is the burst of energy caused by enzymes that send messages to the brain.Thus,resulting in Flight or Fight mechanism.
 
        
             
        
        
        
Well im in middle school and to me that looks like a skin cell breking into two cells so how i would draw that is why it would do that (cause) or how it does it. Hope it works
        
             
        
        
        
Abiotic
An ecosystem involves both the biological (plants, animals, human beings) and non-biological (land, water, soil, and atmosphere) community which interacts as a system. More importantly, the living things are very dependent on the abiotic community since it cannot survive by itself. Every animal, plant and human needs the primary physiological needs of water, food and shelter provided by the abiotic system.  <span> 
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Biotic factors:
Plants
Microorganisms
Macroorganisms
        
             
        
        
        
Answer:
They formed from a cloud of dust and gas.
Explanation:
A nebula is where the formation of stars takes place, so the Nebula Theory would pertain to the planets forming in the same way.
 
        
             
        
        
        
Answer is D. Timothy will lack testosterone and will probably be unable to achieve an erection