<span>Steroids are like hormones that greatly influences bodily activities mostly in growth and function. These functions may modify, change and control one’s body organs or system that’ll vary in form, shape or structure due to these hormone-like compounds and also, it can affect one’s psychological and neurological state. There are several types of steroids. Examples can include: </span><span><span>
1. </span>Sex steroids. These are can influence reproduction and sex characteristics.</span> <span><span>
2. </span>Anabolic steroids. Most abused in many athletic activities. These steroids are used for muscle and bone growth.<span> 
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D. A struggle for existence is apparent.
If a struggle for existence is apparent, natural selection occurs because all of the weak/unfit/unadapted ones die.
        
                    
             
        
        
        
By warming up your muscles (I am assuming you mean by stretching and doing jumping jacks and such, not sitting yourself in front of a heater...) you will have a better overall workout. Your muscles will be ready to work and you will not tire as fast. Also, your muscles will feel better the next day because you got them ready to work out.
        
                    
             
        
        
        
Winter storm advisory is issued by us national weather service when low pressure system produces a combination of winter weather, but not a hazard.