The correct answer is D,
dose this help?
        
             
        
        
        
Answer: The cell would be eukaryotic because it has chloroplasts.
Explanation: Only Eukaryotic cells have structures like chloroplasts, while prokaryotic cells do not.
 
        
             
        
        
        
Hydrosphere
Explanation:
- The dolphin swims in the hydrosphere. 
 - The hydropshere is the region occupied by water on the earth surface. 
 - They are the oceans, lakes, rivers, glaciers e.t.c 
 - The hydrosphere makes up 70% the total surface area on earth. 
 - Ocean occupies a whooping 95% of all. 
 - The hydrosphere is able to support aquatic life and this is why the dolphin with its streamlined body swims in this sphere.  
 
Learn more: 
Atmosphere brainly.com/question/1851697
#learnwithBrainly
 
        
             
        
        
        
<span>b. gravel on the bottom of the aquarium</span>
An ecosystem involves both the biological (plants, animals, human beings) and non-biological (land, water, soil, and atmosphere) community which interacts as a system. More importantly, the living things are very dependent on the abiotic community since it cannot survive by itself. Every animal, plant and human needs the primary physiological needs of water, food and shelter provided by the abiotic system.  <span> 
</span>
Biotic factors:
Plants
Microorganisms
Macroorganisms