Answer: Such constant change has characterized Earth since its beginning some 4.5 billion years ago. From the outset, heat and gravity shaped the evolution of the planet. These forces were gradually joined by the global effects of the emergence of life.
Explanation:
 
        
             
        
        
        
Explanation:
The exchange of gases between the blood and tissue cells is internal respiration. Finally, the cells utilize the oxygen for their specific activities: this is called cellular metabolism, or cellular respiration. Together, these activities constitute respiration.
 
        
                    
             
        
        
        
B. An ecosystem in which plant roots are submerged during parts of the years
        
             
        
        
        
Answer:
the moon because it has less gravity than the earth. so you would jump father on the moon 
Explanation: