A flea and dog are an example of (commensalism herbivory mutualism parasitism) , because the flea irritates the dog's skin and feeds on its blood. Certain bacteria live in the digestive tract of humans , and their relationship is an example of (commensalism / herbivory mutualism parasitism) because the bacteria help humans to break down the food they eat. Cattle egrets eat insects off the back of an elephant, which is an example of (commensalism herbivory mutualism/ parasitism) because the cattle egrets benefit without either harming or helping the elephants.

parasitism

mutualism

commensalism

Explanation:

Commensalism is defined as a relationship between two living organism in which one organism get benefits and the other organism neither benefit nor harm.

Herbivory is defined as the relationship between organisms and plants in which organisms consume plant material.

Mutualism is defined as the relationship between two living organism in which  both organisms benefit each other.

Parasitism is defined as the relationship between two living organism in which one organism get benefits and the other organisms get harmed.

So, a flea and dog are an example of parasitism, certain bacteria live in the digestive tract of humans is an example of mutualism, and relationship between cattle egrets and an elephant is an example of commensalism.

Hence, the correct answer is:

parasitism

mutualism

commensalism

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