Describe the reflex action

A reflex action is the body's rapid, involuntary response to external stimuli, often used in order to protect it from immediate harm. First, a receptor detects a stimulus, such as a heat source which could burn the skin. A nerve impulse is then passed along the sensory neurone from the receptor to the central nervous system (the spinal cord). The impulse is transferred via a synapse (a gap between two neurones) to a relay neurone within the cord, and then on to a motor neurone via a second synapse. The impulse travels along the motor neurone to an effector (such as a muscle or gland) which brings about the desired response i.e a muscle moving a body part away from the heat source in the burning example .

Explanation:

the correct answer is: b. pantala flavescens, because these organisms would have a high level of genetic variation due to sexual reproduction.  

because involves two organisms (parents) whose genetic material combines, sexual reproduction leads to genetic variation in new generations of offspring. the offspring is an unique organism, with new genome, more protected with the higher ability to adapted. this process is fundamental to evolution.