Answer:
Whereas a change in a person may take 10-50 years to manifest itself, changes in the earth can take millions of years to become apparent. Also, humans may experience changes in their personalities as well as in their bodies, while changes in the earth are never psychological.
 
        
             
        
        
        
They are similar to plants because they are they’re just the exact same as plants
        
             
        
        
        
Answer:
<em>This is an example of natural selection (adaptation).</em>
Explanation:
Natural selection tends to favor those organisms which are better adapted to live in an environment.
As tortoises having flat shell and long neck were better adapted to live in barren area, hence through natural selection those organisms were favored in such an ecosystem.
As tortoises that lived on the vegetative lands were more adapted to live in such an ecosystem, hence through natural ecosystem these organisms were favored and increased in numbers.
 
        
             
        
        
        
I believe the correct answer from the choices listed above is the third option. It is oxygen that is a necessary reactant for cellular respiration to occur. Cellular respiration, in a sense, is breaking down sugar in the presence of oxygen.  Hope this answers the question.
        
                    
             
        
        
        
An invasive species is a species that is not native to a specific location, and that has a tendency to spread to a degree believed to cause damage to the environment, human economy or human health.