Answer :
The mouse and rabbit both have a competitive relationship. They both have a place in a similar class. They are in the group of mammalia. There are environmental connections of which two are oppositional and four are harmonious. The oppositional connections are predation and rivalry.
Mouse and rabbit both eat grass, and thus have a competitive relationship in a food web. They belong to the same class, mammalia. They are then are used as a mode of nutrition by the animals like owls, etc. Both are herbivores, and are first order consumers.