A possible Hypothesis probably .
1.The Weather Is Cold And Dry 2.Scratching Your Nose 3.Nasal Septum 4.Medication 5.Allergies
I would say D because both populations are constantly growing and it would be natural selection so it works out if humans just back off
Answer:
<u>acetylcholine</u>
Explanation:
In the pre-synaptic knob there are vesicles which contain a transmitter substance called acetylcholine. When an impulse reaches the synaptic knob, it stimulates the vesicles to move towards the pre-synaptic membrane releasing the acetylcholine.
The transmitter substance makes the membrane permeable. The neuromuscular junction contains the sensory neurone(afferent), motor neurones(efferent) and the relay neurones(connector).