<span>When there is more stimulation, there will be more polarization and depolarization occurring within the cells as they get generated. When the sodium channels are open from the electrical stimuli, it will open up channels that lead to influx of sodium for outside the cells, thereby gains more positivity. Then there is potassium channels that is negatively charged. So the potassium will force the closure of channels.</span>
I believe that the answer is D, The four have molecular similarities, but have their own unique traits. A phylogenetic tree is a diagram like the one shown below which represents the relationship among various biological organisms/species or other entities based upon similarities and differences in their physical or genetic characteristics.
Answer: It helps to regulate circadian rhythm
Exposure to natural light during the day helps regulate the circadian
rhythm, which improves sleep pattern. The term circadian rhythm refers to our
biochemical, physiological and behavioral processes in approximately 1 full day
cycle. Circadian rhythm plays an
important role in
controlling when we fall asleep and when we wake up.
During day light, the secretion of melatonin or sleep hormone is
suppress by melanopsin that keeps people awake and alert. Nevertheless, during nighttime,
melanopsin stimulates the release of melatonin to signal sleeping time. Therefore,
this hormone works the entire day and has direct effect on the circadian
rhythm, which acts as a regulator of our biological clock.