Answer:
What is the problem... nothing is listed??
Explanation:
 
        
                    
             
        
        
        
Answer:
Porifera—gastrovascular cavity, coelomate.
Explanation:
Sponges do not contain digestive system but obtain nutrients through the diffusion process. Porifera is the most commonly asymmetrical in nature but can also have radial symmetry. Porifera has no coelom. 
Lacking a true digestive system, they depend on the intracellular digestive processes of their choanocytes for their energy intake. Gas exchange, circulation, and excretion occur by diffusion between the water and the cells.
 
        
             
        
        
        
Either amino acids or genotypes.
        
                    
             
        
        
        
The correct answer is: prevent reception of a signal in a receiving neuron
Neurotransmitters are signal molecules or chemical messengers which transmit signals across a chemical synapse. Neurotransmitters send the signal, from one neuron (nerve cell) to another neuron, from neuron to muscle cell (motor plate), or from neuron to gland cell.
Drugs that bind to neurotransmitter’s receptor can have two effects on its action:
•	Antagonists-they bind to receptor and thus prevent a neurotransmitter from binding to it
•	Agonists-they bind to receptor and mimic the normal neurotransmitter (have the same effect as neurotransmitter).
 
        
             
        
        
        
Scratching  insect  bites  can   lead  to  infection, a  superficial  crusty  infection  of  the  skin.The  scratching  cause  the  skin  around  the   bitten  area to  break  open  which  causes  infection. Example  of  insect  that  bites  are  mosquito,  midge  and flea among  others.