<span><em>They tell us how life evolved and adapted to different environments and global changes throughout the Earth's development</em>
<em>                                Hope this helps:)</em>
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Answer:
(a) Allow movement in only one plane/direction (that is extension or flexion)
(b) The skeletal system also produces blood cells in their bone marrow
 
        
                    
             
        
        
        
Answer: Not Copy RIght
Explanation:
Pluto is considered a dwarf planet because it does not pass around its orbit. It orbits  a disc-shaped zone beyond the orbit of Neptune called the Kuiper Belt, a distant region occupied by frozen corpses left over from the formation of the solar system.
 
        
                    
             
        
        
        
CO2 is considered organic because it doesn’t contain a hydrogen. Organic compounds must contain carbon bound to hydrogen and possibly other elements.