Hormones can be divided into three classes. lipid-derived, amino acid-derived, and peptide (peptide and proteins) hormones. Cholesterol is a fat and fats are lipids. They fall into the protein and lipid category.
        
                    
             
        
        
        
<span>the time when the sun crosses the plane of the earth's equator, making night and day of approximately equal length all over the earth </span>
        
                    
             
        
        
        
<span>a. What is one adaptation of a mangrove tree species that allows it to survive in its environment? 
Answer: </span><span>Two key </span>variations they need are the flexibility<span> to survive in </span>wet<span> and </span>hypoxia<span> (no oxygen) soil, </span>and therefore the<span> ability to tolerate </span>briny<span> waters. Some mangroves </span>take away<span> salt from </span>briny water<span> waters through ultra-filtration in their roots.</span>
        
                    
             
        
        
        
using cars that get lower gas mileage