Answer:  ZW
The sex chromosomes in birds are known as Z and W, and the presence of a W chromosome causes the development of a female <u>(ZW).</u>
Explanation:  ducks are cute tho lol
 
        
                    
             
        
        
        
Answer:
B; Not work
Explanation:
Water constantly moves around the Earth and changes between solid, liquid,  and gas. This all depends on the Sun's energy. Without the Sun there would be no water cycle, which means no clouds, no rain, no weather.
 
        
                    
             
        
        
        
Answer:
"Energy flows in one direction, matter recycles."
Explanation:
Matter "returns" to the environment by the deutucators. Energy comes from the sun and is transmitted to higher trophic structures.
 
        
             
        
        
        
Geologic time is divided into units based upon types fossils found in each area .
I hope that's help !