Which structure is at work when the body deals with reflex actions? the heart the brain stem the vertebral column the spinal cord

The answer is spinal cord

Its spinal cord

Explanation:

Reflex action is an instantaneous involuntary response to a stimuli. Like when you touch a hot object, instantaneously you move your hand away from the heat source, such action is reflex action. It happens suddenly without much thinking. Spinal cord plays a major role in this. Please look at the reflex arc below for further clarification. The path followed by reflex action is called reflex arc.

Stimulus -> sensory receptor -> sensory neuron -> relay neuron (in spinal cord) -> motor neuron -> effector -> response

the glands which are associated with each description is given below:

if the hares very faster than they are now, and thus the lynx's hunting success rate drops because it will be harder to catch them, the rate that will change will be the pray-rate. the pray-rate will change because more hares will be able to survive, thus more individuals for reproduction, so the end result will be increasing population of hares.

the predator-rate will remain pretty much the same because there will be more than enough pray, but the hunting success rate is stagnant.