| spawning(nature, ecology, ecosystem) |
| stream bed(nature, ecology, ecosystem) |
| stream pool(nature, ecology, ecosystem) |
| substrate(nature, ecology, ecosystem) |
| thermal pollution(nature, ecology, ecosystem) |
| trophic level(nature, ecology, ecosystem) |
| trophic state index(nature, ecology, ecosystem) |
| upland and lowland(nature, ecology, ecosystem) |
| water column(nature, ecology, ecosystem) |
| water garden(nature, ecology, ecosystem) |
| wetland(nature, ecology, ecosystem) |
| fishing(expression, nature, ecology, ecosystem) |
| pet(noun, animal, creature, being) |
| acrodont(noun, animal, creature, being) |
| adult(noun, animal, creature, being) |
| biped(noun, animal, creature, being) |
| captive(noun, animal, creature, being) |
| chordate(noun, animal, creature, being) |
| conceptus(noun, animal, creature, being) |
| creepy-crawly(noun, animal, creature, being) |