Answer:
Depending on the food pyramid, on the side there may be something that says decomposers. These eat from all of the sections of the pyramid.
Energy flows from the bottom to the top, and then to the side with the decomposer.
  
        
             
        
        
        
This is called secondary active transport
        
                    
             
        
        
        
Answer:
Q.1: I can't help you with this, sorry :(
Q.2: Seaweed is the producer because it takes energy from the water and sun in thermal reactions.
Q.3: Phytoplankton is the second-order consumer because they eat first-order consumers.
Q.4: Whelks and crabs because they eat limpets, which eat producers, and they also eat seaweed.
Q.5: Gulls are carnivores because they eat the crabs, and so are crabs because they eat mullets
Q.6: Limpets and lobster would become less populated, but not yet endangered. Gulls would starve and probably disappear from this ecosystem.
Q.7: Whelks' numbers would decrease because of the number of lobsters consuming them, but then lobsters would starve because of the decline in their food. Then this would repeat, shaking the whole ecosystem.
 
        
                    
             
        
        
        
Blood, urine, tissue/skin, saliva, hairs, etc.
        
             
        
        
        
Answer:
An orange peel in a trash will start to decompose. 
- The carbon atoms will be released into the air as a result of decomposition.
 
- These carbon atoms will be converted into carbon dioxide in the atmosphere. 
- Plants will take in this carbon dioxide for making food by the process of photosynthesis.
- When animals will consume the pants, the carbon products will be accumulated int he body of the animals. Some of the carbon will be converted into carbon dioxide in the animals and will pass out of the animal's body through respiration.