Saving the wild.

4. — protecting resources, ecosystems, and structures for present and future generations.
8. — the place where a plant or an animal lives.
10. pets — animals that have not been domesticated, such as boa constrictors, green iguanas, sugar gliders, parrots, and saltwater and freshwater aquarium fish.
13. — the genetic variability of living organisms on our planet.
15. pets — animals bred for centuries to select traits that make them well-adapted for living with humans.
17. species — a species of plant or animal of which numbers are decreasing at an alarming rate and is threatened with extinction by human-made or natural changes in the environment.
18. — taking care of our environment by wisely managing its resources.
19. — watercraft such as ships.
20. — returning resources, ecosystems, and structures to their original (or near-original) condition.
21. use — using resources in ways that do not deplete them.
22. — no longer existing.

1. — kangaroos, wallabies, and other marsupials of the family Macropodidae.
2. — a unit of plants, animals, and nonliving components of an environment that interact.
3. — a species represented by living creatures.
5. — sounds produced for auditory communication.
6. — a wireless technology in which information is measured from a remote source and reported to a receiving station for analysis.
7. species — a species likely to become endangered.
9. — the geographical occurrence of a species of plant or animal.
11. — a group of plants or animals of the same species that live in the same area and have the opportunity to breed with each other.
12. — organized industry of catching, processing, and selling fishes or other aquatic species.
14. — growing or living on land.
16. — a fishing line made of a single untwisted strand of synthetic filament.