Answer:
I believe the correct answer would be spem cells. Please mark brainliest.
Explanation:
 
        
                    
             
        
        
        
The biome that exist closest to the Earth's poles are descibed as polar
        
             
        
        
        
Answer:
Explanation:
The answer is meanders
Hope this helps 
Plz mark it as brainliest!!!!!!!!!
 
        
             
        
        
        
Answer:
c) matter in an ecosystem flows in one direction and is never reused.
Explanation:
A is true
 
        
                    
             
        
        
        
Answer:
it cannot be easily degraded in our environment.Like humans, animals and plants are exposed to PBTs in the environment through air, water and food. ... Persistent bioaccumulative toxic substances (PBTs) are chemicals that do not degrade easily in the environment.