Answer:
The living organism is the organism that responds to external stimulus, moves, grows, respire, reproduce, eat and excrete.  
Movement - An organism moving from place to place.
Respiration - The release of energy from glucose, occurring in every cell. we respire in order to produce energy  
Sensitivity - the ability to detect and respond to stimuli. When we touch something hot, we remove our hand suddenly.  
Growth - The production of new cells in an organism. 
Reproduction - The process which is used to create offspring similar to parents.
Excretion - The release of harmful substances from the body. We excrete carbon dioxide when we exhale.
Nutrition - Consumption of food for energy. We get nutrition by eating three meals a day.
 
        
                    
             
        
        
        
<u>Answer</u>:  D. GABA (gamma-aminobutyric acid).
<u>Explanation</u>:
- Neurotransmitters are chemical messengers that cross the synaptic gaps between neurons and thus, relay the message from one neuron to another. 
- Based on the response they produce, neurotransmitters can be inhibitory or excitatory in nature. 
- An <em>inhibitory</em> neurotransmitter is the one decreases the action potential producing ability of the neuron whereas the <em>excitatory</em> neurotransmitter does the opposite. 
- Example of an excitatory neurotransmitter is <em>glutamate</em>.
- <em>GABA</em> is the major inhibitory neurotransmitter which is found in the adult brain whereas glycine is another inhibitory neurotransmitter that acts at the spinal cord.
 
        
                    
             
        
        
        
Answer:
C for he first one,A for the second one
Explanation:
Not 100% sure but like 82% sure.