a. Excretion and Secretion
b. Absorption and Assimilation
c. Ingestion and Egestion
d. Diphyodont and Heterodont
e. Incisors and Canines

Explanation

a. `{:("Excretion","Secretion"),("The process of eliminating or","a process by which substances are produced"),("expelling waste matter.","and discharged from a cell, gland, or organ"),(,"for a particular function in the organism or for excretion."):}`
b. `{:("Absorption","Assimilation"),("Absorption is the process by which nutrients obtained","Assimilation means the incorporation of the"),("after digestion are absorbed by villi and circulated","abosorbed food materials into the tissue cells"),("throughout the body by blood and lymph and suppled","as their internal and homogenous component."),("to all body cells according to their requirements.",):}`
c. `{:("Ingestion","Egestion"),("The process of nutrition begins with intake","The undigested or unassimilated portion of the"),("of food, called ingestion.","ingested food material is thrown out from the"),(,"body through the anal aperture as faecal matter."),(,"This is known as egestion."):}`
d. `{:("Diphyodont","Heterodont"),("In human beings two sets of teeth","Permanent teeth are of four types"),("(Diphyodont) are developed in their life time.","(Heterodont)"):}`
e. `{:("Incisors","Canines"),("Type of teeth used for cutting and","Type of teeth used for tearing and piercing of"),("bitting foods.","food."):}`