Question

how does form follow function in the mouth and digestive structures of animals?

Answer 1

Form follows -
4 major stages in digestion are  Ingestion ,  Digestion ,  Absorption / Assimilation ,  Elimination

Ingestion
ingestion takes place when the the food is in the mouth , specially when we using the teeth for chewing and grinding the food , saliva released from the salivary glands has lubriacte and chemical effects on food - which sends it onwards down the digestive tract .Ingestion is the process by which food is taken into the alimentary canal

Digestion
Digestion is the process by which ingested (food) material is broken down in the earlier stages of the alimentary canal into a form that can then be absorbed and assimilated into the tissues of the body.
it includes 2 types of processes -
Mechanical ( teeths are responsible )
Chemical ( action of digestive enzymes)

Absorption / Assimilation
uptaking fluids or other substances by the tissues of the body is Absorption . Digested food is absorbed into the bodily fluids blood and lymph from the alimentary canal. Most of the absorption occurs in the jejunum and the ileum of thesmall intestine . the process by which components/chemicals from food are taken into the cells of the body , after the food has been digested and absorbed is Assimilation.

Elimination
Elimination is the last stage of digestion. elimination is the process of excretion of metabolic waste products, incl. from the blood via the excretary organs