The crucian carp , a scandinavian fish , thrives in shallow ponds that freeze over during winter. while other creatures in the pond does from lack of oxygen , these carp are able to obtain energy through a biochemical pathway that does not require oxygen this characteristic is an example of a

The correct answer is "favorable adaptive trait that has led to increased survival."
An adaptive trait is a trait which has evolved through natural selection and has an important role in the functions of an organism. Since the adaptive trait is favorable it will stay in the population and it will increase the survival of the organism that possesses it.

Regular or uniform type