Answer:
The three principal organs of seed plants are roots, stems, and leaves. These organs perform functions such as the transport of nutrients, protection, and coordination of plant activities. Roots: absorb water and dissolved nutrients.
Explanation:
 
        
                    
             
        
        
        
The answer is D.
 A retrovirus is any of a group of viruses that  characteristically carry their genetic information in form of RNA.  These viruses have an enzyme called reverse transcriptase from which they derive their name because they follow the first step  of the central dogma backward  thus "retro" which means backward.
Reverse transcriptase makes DNA from RNA template  thus reversing the usual pattern of transcribing RNA using DNA as the template.
The central dogma of  molecular genetics  summarizes steps of protein synthesis as DNA → RNA → protein.  But retroviruses have modified the process to be  RNA → DNA → RNA  → protein.
 
        
             
        
        
        
The formation oil, that is, sweet crude, is typically  that accumulate on the seafloor and "kitchen" of the geothermal gradient to be altered in petroleum products.while <span>Most of the </span>coal<span> we use now was </span>formed<span> about 300 million years ago, when much of the </span>earth<span> was covered by steamy swamps.
hope that helped</span>
        
             
        
        
        
<span>there is no easy definition of an algae. Algae are generally microscopic organisms, are usually thought of as simple aquatic plants which do not have roots, stems or leaves and have primitive methods of reproduction.  </span>
        
             
        
        
        
Blood Tests
A creatinine level of greater than 1.2 for women and greater than 1.4 for men may be an early sign that the kidneys are not working properly. As kidney disease progresses, the level of creatinine in the blood rises.