I believe it is "arctic predators or winter hunters" they all hunt in the snow and all of them are predator which mean they eat all different types of small animals like mice.
The correct answer is: Heartburn often results when the gastroesophageal sphincter fails to close properly.
The gastroesophageal sphincter is a muscle located at the bottom of the esophagus that has to be relaxed in order to allow food to flow down into the stomach. After it contracts (tightens), the food and the stomach acid can’t flow back up into the esophagus.
When the gastroesophageal sphincter fails to close properly acid reflux occurs and causes the heartburn.
The answer should be the contraction of muscles.
Hope this helps mate.
Any theory must contain a meaningful concept with new evolution to accept by the scientific community
Answer: thin leaves
Explanation:thin leaves because they are supposed to resemble needles