Depends what environment it is in.
Mostly its just the environment they are in to estimate what genetic traits they have that will help them survive and reproduce in their habitat.
Acquired traits.
Adaptations.
Adaptations.
A
they have a oil on their fur or blubber so they are warm and can adapt to weather quickly
Traits that enable an organism to survive and reproduce are known as adaptations. Each organism has specific adaptations suitable for its environment.
In science, this sometimes called the survival of the fittest or natural selection.If all individuals in a species are not exactly clones of each other but have small variations in the genes (traits), some will do better when the environment changes. These traits will be 'favored' over other traits.
the ones which have mutations which would help them to survive
That is how organism adapts to changes in the environment in order for it to stay alive and continue its genes through its offspring.
Natural Selection a theory originated by Charles Darwin states that the fittest will survive. The organisms most likely to survive are the fittest, the ones that can adapt themselves to a changing environment. Edit: it's those with traits best suited to their environment. -Holy122