Each skeletal muscle fiber is controlled by a motor neuron at a single

Neuromuscular joint

Explanation:

At the neuromuscular joint, an impulse is transmitted through the synaptic cleft. When an impulse reaches the synaptic knob, it stimulates the vesicles to move towards the presynaptic membrane releasing the acetylcholine. A resulting action potential is transmitted as a nerve impulse along the neuron.

the correct answer is:

a population changes in response to a change in the environment.

the water is warmed up by the sun and then it evaporates into the atmosphere. the sunlight warms the water by its heat. water is then cooled down and condensation takes place. the water then finally returns back to the earth by the process of precipitation in the form of rain or ice.

explanation: