Which one of the following statements is true regarding voluntary and involuntary responses? a. voluntary responses control the activity of glands. b. voluntary responses originate in the sensory receptors. c. involuntary responses are part of the autonomic system. d. involuntary responses may include the spinal cord and not the brain.

The correct answer would be C. Involuntary responses are part of the autonomic system.

The autonomic nervous system (ANS) is sub-division of the peripheral nervous system (PNS) mainly associated with involuntary responses.

It regulates the psychological actions such as heart rate, respiratory rates, digestion, urination, sexual arousal, pupillary responses, thermoregulation, fight and flight responses et cetera.

the correct answer is:

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