Step 1: Understanding the Concept
Organisms have features that help them live and breed in their habitat.
Step 2: Definition
Morphological, physiological or behavioural attributes that enable survival and reproduction in a habitat are called adaptation.
Step 3: Compare the options
Aestivation and hibernation are summer and winter dormancy, and emigration is movement out of a population. They are only specific responses.
Final Answer:
Such attributes are called adaptation.
\[ \boxed{\text{(B) }\text{Adaptation}} \]