Keywords
adaptation, amphibian, animal, arthropods, biome, carnivore,  classification, classification key, crustacean, bird, diversity,  ecologist, ecology, ecosystem, endangered, environment, fish, fungi, habitat, herbivore, insect, invertebrate, kingdom, laboratory, mammal, molluscs, monerans, palentologist, plants, protists, reptile, species, sponges, vertebrate, worms,