Describe the common features that determine why invertebrates, such as sponges, cnidarians, and flatworms, do not require a circulatory system. Define and distinguish the terms invertebrate and vertebrate circulation. Compare and contrast the different modes of respiration in different animals. Define partial pressure and appreciate the role of partial pressure gradients in respiratory mechanism. Define and distinguish the terms intracellular and extracellular digestion and identify the mode of digestion seen in different animals. Describe the structure and function of photoreceptors in different invertebrates. Determine how statocysts are adaptive for animals that burrow underground or live deep in the ocean. Compare blood, hemolymph and hemocyanin.
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This topic covers under Biology subject as a part of the Animal Form and Function topic and this topic contains following sub topics Life Processes Respiration Digestion Vision and Sense Immune Mechanism Endocrine and Nervous system