The growing or farming of marine plants or animals under controlled conditions is called aquaculture.
<h3>What is aquaculture?</h3>
Aquaculture is the farming of aquatic animals or plants, including breeding, raising and harvesting in different types of  of water environments in controlled conditions.
Aquaculture includes the following:
- Mariculture - involves using seawater
- Fish Farming - the farming of fishes
- Algaculture: - involves the farming of algae.
In conclusion, the growing of marine organisms is called aquaculture.
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Answer/Explanation:
b) kidney and bladder
Kidneys are the main organ in the excretory system and the bladder stores the urine in the body. These are two of the organs that make up the excretory system.  
 
        
             
        
        
        
Answer:
C. top soil has more organic matter.
Explanation:
 It's more fertile than subsoil, due to having more organic matter and because fertilizers are usually added to the topsoil only.
 
        
             
        
        
        
Increases genetic variation, which in and of itself has extreme benefits such as protection against disease, capability to evolve, etc
        
             
        
        
        
Cell wall is an envelop covering the cell.Owing to its exceptional strength and its ability to control cell shape,the extracellular matrix of eubacteria,algae,fungi and plants is called the cell wall.cell wall provides rigidity and protection.It help in maintaining the shape and stiffness.