Select the word or phrase that correctly completes the statements. refers to the breakdown of food by enzymatic action. during the teeth break down food into smaller pieces. during enzymes break down food into molecules.

Each statement represent a stage of the human digestive system. The first two stages are part of the cephalic phase.

Salivary amylase refers to the breakdown of food by enzymatic action. Saliva can be considered as the first reaction to food, it can be produced by just seeing or smelling food, this saliva is what contains enzymes to start breakdown food. People don't know that digestion already begins in the mouth.

During chewing, the teeth break down food into smaller pieces, during this stage is produced the bolus, which is swallowed to enter the stomach.

Next, during the gastric phase, enzymes break down food into molecules. The gastric acid does its job to pass the result to the duodenum.

Then, once is placed in the duodenum, the third stage begins, the pancreas produces a number of enzymes that breakdown food furthermore. After that, the food passes to intestines to absorb nutrients and the waste is defecated through the rectus.

cognitive activities are mental processes through which we make sense of the world around us or get to know or experience our environment (internal and external). examples of cognitive activities are reasoning, thinking, perceiving, decision-making, listening, observing,etc.

                                                        water

a colorless, transparent, odorless, tasteless liquid that forms the seas, lakes, rivers, and rain and is the basis of the fluids of living organisms.

                                                        halon  

any of a number of unreactive gaseous compounds of carbon with bromine and other halogens, used in fire extinguishers, but now known to damage the ozone layer.

                                                  dry chemical

extinguishing agent used on class a, class b, and class c fires.

                                                  carbon dioxide

a colorless, odorless gas produced by burning carbon and organic compounds and by respiration. it is naturally present in air (about 0.03 percent) and is absorbed by plants in photosynthesis.