Conservation biology supports all but one of the following practices.

The question is incomplete. Following are the options:

A) the preservation of natural habitats

B) the protection of endangered species

C) the management of available natural resources

D) the introduction of alien species to an area outside their normal range

The practice which conservation biology doesn't support is D) the introduction of alien species to an area outside their normal range

Explanation:

Conservation biology can be described as a branch of biology in which humans try their best to protect the biodiversity present on Earth. The management of species, their habitat, their ecosystems and natural resources all come under this field. Strategies to protect endangered species and increase their number is also the concern of conservation biology.

However, conservation biology has nothing to do aliens, hence option D is not a part of conservation biology.