I don’t understand this question
Answer:
Rats have same physiology, similar organs and similar body plans just like humans.
Explanation:
Brown rats experience similar genetic diseases as humans because of same physiology, similar organs, similar body plans and also belongs to similar group of mammals. Due to these similar physiology, organs and body structure, the rats also experience similar genetic diseases just like humans. So that's why Scientists chose brown rats to study genetic diseases occur in humans.
Niche is the organism's biological role in the ecosystem. It is how it copes and meets the demands of living in an environment, including finding good, shelter and all its interactions with the biotic and abiotic components of the ecosystem.