The significance of a notochord in the evolution of chordates is that it Allowed the development of a more complex nervous system. Eliminated the need for segmentation. Allowed the organism to grow larger. Provided an internal attachment point for muscles. Both A and C. Organisms in which a circulating body fluid is distant from the fluid that directly surrounds the body\'s cells are likely to have An open circulatory system. A closed circulatory system. A gastrovascular cavity. Branched tracheal system. Hemolymph. How do crustaceans differ from insects? Crustaceans have an exoskeleton made of chitin. Crustaceans have jointed appendages. Crustaceans have legs in their abdomen and thorax. Crustaceans are found exclusively in marine habitats. Both A and C. A characteristic of hominids is Larger brain. Bipedalism. Nighttime activity Monogamy. Both A and B. What do plants and animals have in common? Plants and animals need sources of energy. Plants and animals need carbon and nitrogen atoms. Plants and animals need oxygen. Plants and animals give off carbon dioxide, All of the above, A bilaterally symmetrical, wormlike animal that has a pseudocoelom, a complete digestive tract and a cuticle could be a member of which one of the following phyla? Cnidarian Platyhelminthes. Annelida. Nematode, Chordate Solution 22. D Notochord provide the rigid structure for muscle attachment. It has essential roles in vertebrate development. 23. B) a closed circulatory system In this blood flows in the closed vessel,and this type of circulatory system found in the Vertebrates, and a few invertebrates 24. D. Crustaceans are exclusively marine habitat, but some insects live inside the water. 25 .B They have two main characteristics; bipedilism and nonhoning teeth. 26 E 27 D. Roundworms (or nematoda) are wormlike animal that has a pseudocoelum,, a complete digestive tract, and a transparent cuticle and are bilaterally symmetrical..