Use these animal features to infer relationships among animal phyla: p. 640 1. p

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Use these animal features to infer relationships among animal phyla: p. 640 1. presence or absence of tissues. 2. pattern of embryonic development (diploblastic and triploblastic 3. symmetry 4. type of body plan 5. presence or absence of true body cavity 7. segmentation 1. Presence or absence of Tissues? What animals do not have highly organized complex tissues? ______ 2 Pattern of Embryonic Development Tissue/Germ Layers? Name animals that only have 2 tissue layers? _____ ____ _____ What term means embryonic development with only 2 tissue layers? (diploblastic/triploblastic) Diploblastic embryos have an outer germ layer (Endoderm/ectoderm) & an inner germ layer (Endoderm ectoderm) Most animals have 3 tissue layers and can form organs and organ systems? What term means embryonic development with 3 tissue layers? (diploblastic/triploblastic) Triploblastic embryos have an outer germ layer (endoderm/mesoderm/ectoderm) And an inner germ layer (endoderm/mesoderm/ectoderm) and a germ layer between the outer and inner layers called (endoderm/mesoderm/ectoderm) (endoderm/mesoderm/ectoderm) gives rise to skin and the nervous system. (endoderm/mesoderm/ectoderm) gives rise to the lining of digestive sac. (endoderm/mesoderm/ectoderm) gives rise to muscles, bones, and internal organs. 3. Types of Symmetry? A body is said to be symmetrical if it can be divided by a plane such that the resulting pieces are nearly identical. (Asymmetry/radial symmetry/bilateral symmetry) means there is no symmetry. b. (Asymmetry/radial symmetry/bilateral symmetry) means there are 2 or more planes of symmetry giving a "spoke pattern" (pie or vase shapes) c. (Asymmetry/radial symmetry/bilateral symmetry) means there is only one planes of symmetry giving 2 sides. Draw animal with radial symmetry (ex jelly fish) and animal with bilateral symmetry (ex butterfly) Over 99% of modern animals have bilateral symmetry. Evolution of nervous system and of the head are linked. Animals with (radial/bilateral) symmetry have a nerve net Animals with (radial/bilateral) symmetry have a central nervous system and this occurs with cephalization -the evolution of the anterior (head/tail) where feeding, sensing, and processing of info occur. Cephalization promotes coordination of the body with sensory info being collected in the head. What is the advantage of cephalization? ______

Explanation / Answer

1) The animals that do not have highly organised complex tissues are listed below,

2) Animals which have only two tissue layers are listed below,

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