Which of the following in NOT an example of a symbiotic relationship? O A mother bear caring for her cub
A bacterial infection
A worm living in a cow's intestine
оо
An orchid growing at the top of a tree

The correct answer is the first option

Explanation:

A symbiotic relationship is a close interaction between two organisms in which at least one of the organisms in this interaction benefits. There are three types of symbiotic relationship; mutualism (is that in which both organisms benefit from one another, example of this type of interaction include Oxpeckers and Zebras), commensalism (is that in which one organism benefits while the other is neither affected nor harmed, example of this type of interaction include an orchid growing at the top of a tree) and parasitism (is that in which an organism in this interaction benefits to the detriment of the other organism, examples include bacterial infection and a worm living in a cow's intestine). Thus, the only odd option here is the first option which is not a form of symbiotic relationship but rather a characteristic (showing parental care) that mammals display.