Answer:
D.
Explanation:
The immune system lowers the chances of bacteria, viruses, and diseases entering your body
 
        
             
        
        
        
Answer:
Everything in Earth's system can be placed into one of four major subsystems: land, water, living things, or air. These four subsystems are called "spheres." Specifically, they are the "lithosphere" (land), "hydrosphere" (water), "biosphere" (living things), and "atmosphere" (air).
So I would say seaweed belongs in the hydrosphere.
I hope it helps.
 
        
             
        
        
        
In a mutualistic relationship, both species benefit.
Predation is when a predator eats another organism, in which the predator benefits and the other organism dies.
In parasitism the parasite benefits while the host is harmed.
In competition, neither species benefits because they're too busy fighting over resources.
Commensalism is when only one of the two species benefits but the other is not harmed.