While preparing to build a hydroelectric dam, the safety for various potential hazards must be given attention. Some of these include special attention towards the channels leading to dangerous areas or spillways, attention towards the effectiveness of the barriers, areas where higher currents exist, attention must also be given towards environmental aspects such as damming the rivers impacts wild and aquatic life, reduction of dissolved oxygen harming the fishes, and also while building the dam the communities living around should be taken into consideration that there is no potential hazard to them.
 
        
                    
             
        
        
        
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Maybe Transporting cells around the body....
 
        
             
        
        
        
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during the tadpole stage, they relie on the oxygen in the water to live, unlike frogs in the adult stage who can use the oxygen in the air on land 
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a tree because its a plant 
 
        
             
        
        
        
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Allowing a small but controlled portion of a pest population to remain does less damage to ecosystems, soils, water, and air. Another feature of IPM would be making a habitat more complex, such as mazes, so it can slow the spread of parasites. No-till or low-till agriculture is another feature of IPM because this helps natural enemies of some pests to build up in the soil, whereas plowing destroys the habitats of these enemies. 
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Edgen 2020 plus I got a 100 when I typed this out.