The <u>vesicles</u> pick up whole and partial neurotransmitters from the synaptic gap and bring them into the terminal button, where other structures recycle these neurotransmitters for future use.
Within the presynaptic terminals is where the synthesis of the small-molecule neurotransmitters takes place. A process known as slow axonal transport is responsible for moving enzymes from the neuronal cell body to the cytoplasm of nerve terminals at a rate of 0.5–5 millimetres each day. These enzymes are necessary for the production of transmitters and are produced in the neuronal cell body. Transporter proteins, which are typically located in the plasma membrane of the nerve terminal, are the ones responsible for bringing the precursor chemicals that these synthetic enzymes use into the terminal. Enzymes produce a neurotransmitter pool in the cytoplasm, which must then be loaded into synaptic vesicles using transport proteins in the vesicular membrane. Within the synaptic vesicles, the final synthetic steps of the production of certain small-molecule neurotransmitters are actually carried out.
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Predator and prey populations affect each other because if a predator of one prey kills that one animal than that animal dies and the prey decrease by one and when one predator dies from being killed or just naturally dying, then the predators decrease by one.
ANSWER
The correct answer is A
<u>EXPLANATION</u>
From the equation 
<u>L.H.S.</u>
Fe = 1
O =2
<u> R.H.S</u>
Fe =2
O =3
Now, let try to balance the oxygen atoms first,
To do this, we know the Least Common Multiples of 2 and 3 is 6
To get 6 atoms of oxygen at L.H.S multiply 2 by 3 and on the R.H.S, multiply 3 by 2
L.H.S.
R.H.S
This means that, 3 should be in front of 
at the L.H.S and 2 should come before 
in the R.H.S of the equation
Now, we have
L.H.S.
Fe = 1
O = 6
<u>R.H.S</u>
Fe =4
O =6
The equation is still not balanced since Fe is not balance
The Least Common Multiple of 1 and 4 is 4
Which means that we need to multiply 1 by 4 at the L.H.S and 4 by 1 at the R.H.S
L.H.S.
R.H.S
We now, have
<u>L.H.S. </u>
Fe= 4
O=6
<u>R.H.S</u>
Fe =4
O=6
Hence the balanced equation is
