Answer:
Cloud iridescence
Sunlight travels through the cloud and is diffracted by the droplets, creating the rainbow effect. It can appear as a patch or band at the cloud's edges and changes as the cloud evolves.
Explanation:
Answer: This is a vertebrate animal with bilateral symmetry which has an endoskeleton. Most reproduce sexually through external fertilization.
Explanation:
I'm Smart
Because all those energy sources are natural and will always be there, when ever there is a need for extra energy.
Answer:
The correct option is b. lower esophageal sphincter
Explanation:
The esophagus is the initial part of the digestive tract and its function is the transport of the alimentary bolus from the pharynx to the stomach, through the thorax and avoid the reflux thereof. It begins and ends in two sphincter structures, the upper esophageal sphincter and the lower esophageal sphincter, which separate it from the pharynx and stomach. The lower esophageal sphincter has two functions: relax during swallowing and prevent reflux of the gastric contents into the esophagus in the postdeglutory period. After swallowing, there is a relaxation of the lower esophageal sphincter, pressure dropping to levels similar to those of the gastric fundus, which allows the bolus to enter the stomach. This relaxation lasts a few seconds and is followed by a strong contraction that prevents backflow of food.
