Which of the following statements is true? a thin layer of chyme protects the lining of the digestive tract from being broken down by enzymes. hydrochloric acid (hcl) begins the partial digestion of fats in the small intestine. cystic fibrosis is an infectious disease that causes the muscles that control swallowing to malfunction. heartburn often results when the gastroesophageal sphincter fails to close properly.

Astudent sees several ants walking up a wall following the exact same trail that an ant took earlier. she wants to apply the scientific method to determine how the ants detected the trail. which of these steps would come first in her application of the scientific method? perform an experiment by cleaning the scent away from part of the trail. draw a conclusion that the ants follow a scent trail. make a prediction about what the ants will do after she cleans away part of the trail. hypothesize that the ants are following a scent trail that the first ant left.