A virus is a microscopic particle that can infect the cells of a biological organism. Viruses can only replicate themselves by infecting a host cell and therefore cannot reproduce on their own. It has been argued extensively whether viruses are living organisms.
 
        
             
        
        
        
B because when the positive feedback happens it increases the temperature and when the negative feedback occurs the temperature lowers itself
        
                    
             
        
        
        
Answer:
<h2>All deuterostomes exhibit radial symmetry in their bodies.</h2>
Explanation:
deuterostomes :  All deuterostomes are triploblastic and have 3 layers:
 i) endoderm, ii) mesoderm and iii) Ectoderm
In deuterostomes , a mouth that develops separately from the blastopore.
Taxonomically, the deuterostomes  defines as any member of the phyla (Chordata, Hemichordata, Echinodermata, etc) in which the anus appears first,  and it develops at or near the blastopore.
 All deuterostomes have a coelom.  
All deuterostomes have a similar pattern of early embryonic development.
 
        
             
        
        
        
The hear makes sure that oxygen taken in by the lungs gets to the brain.