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Consider the following statements and choose the correct answer: 1. The biogeographical realms are regions made up of whole continents, or of large parts of a continent, separated by major geographic barriers and characterized by the presence of certain unique animals and plants 2. In each biome the kind of climax vegetation is uniform - grasses, conifers, deciduous trees but the particular species of plant may vary in different parts of the biome 3. There is usually a sharp line of demarcation between adjacent biomes 4. The definition of biome includes not only the actual climax community of a region but also the several intermediate communities that precede the climax community
Notochord is present throughout life in___________?