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Intro to Animals

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
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Question
Answer
the series of cell divisions that occur immediately after an egg is fertilized   cleavage  
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an animal that obtains food by eating other organisms or their by products   heterotroph  
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a cavity that is filled with water and that has a support function   hydrostatic skeleton  
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a body cavity that contains the internal organs   coelom  
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a hard, external, supporting structure that develops from the ectoderm   exoskeleton  
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the formation of embryonic germ layers   gastrulation  
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a cavity that serves both digestive and circulatory purposes in some animals   gastrovascular cavity  
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a type of egg that is produced by reptiles, birds, and some mammals that contain a large amount of yolk   amniotic egg  
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an animal whose mouth does not derive from the blastopore   deuterostome  
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the staage of an embryo before gastrulation   blastula  
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the concentration of nerve tissue and sensory organs at the anterior end of an organism   cephalization  
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an internal skeleton made of bone and cartilage   endoskeleton  
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animal that does not have a backbone   invertebrate  
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a stiff rod that develops along the back of an embryo   notochord  
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the embryonic blastopore develops into the mouth   protostome  
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a member of the extinct order of mammal-like reptiles that likely gave rise to mammals   therapsid  
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an animal that has a backbone   vertebrate  
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cells that lack cell walls   multicellular heterotroph  
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a bony skull and an internal skeleton made of bone or cartilage   vertebrates  
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most bilaterally symmetrical animals have an anterior concentration of sensory structures   cephalization  
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end result of cleavage   blastula  
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the blastula begins to collapse inward during...   gastrulazation  
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extinct order of mammal-like reptiles that were dominant on land briefly and that gave rise to mammals   therapsid  
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a rod-shaped supporting axis found in the dorsal part of the embryos of all chordats, including vertebrates   notochord  
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watertight, scale-covered skin and the amniotic egg   the major evolutionary innovations that first appeared in reptiles  
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Created by: la2012
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