Answer: The answer is C- Gamma amino butyric acid and glycine are excitatory neurotransmitters.
Explanation:
This is because Gamma amino butyric acid (GABA) and glycine are known to be inhibitory neurotransmitters in the central nervous system. They are both amino acids, they act as inhibitory neurotransmitters by blocking nerve impulses. Inhibitory neurotransmitters are known to decrease neuron's action potential. 
 
        
             
        
        
        
C. Cell membrane 
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A frameshift mutation is a type of mutation involving the insertion or deletion of a nucleotide in which the number of deleted base pairs is not divisible by three. "Divisible by three" is important because the cell reads a gene in groups of three bases. Each group of three bases corresponds to one of 20 different amino acids used to build a protein. If a mutation disrupts this reading frame, then the entire DNA sequence following the mutation will be read incorrectly.
        
             
        
        
        
Diploblastic and triploblastic embryos. 
During embryogenesis, diploblasts develop two embryonic germ layers: an ectoderm and an endoderm or mesendoderm. Triploblasts develop a third layer—the mesoderm—which arises from mesendoderm and resides between the endoderm and ectoderm.
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stem cutting
► planting a portion of an immature cane's stem as a seed into the roots.