![]() The mouth of a _ is directed upwards.Ĭnidaria have muscle and nerve fibers which enable them to have directional movement. ![]() The life cycle of cnidarians is equally divided into polyp and medusa phases. Which of the following germ layers is not present during cnidarian development?Ĭnidarians have unique stinging cells called _ with which they can trap or paralyze their prey. The functions of the gastrovascular cavity are _. Organisms of the phylum Cnidaria display a _ level of organization. Which of the following phyla is characterized by animals that have radial symmetry?Ĭnidaria are tubular or bell-shaped animals that reside mainly in shallow coastal waters. Jellyfish and comb jellies are classified as the same phylum. Sponges are classified on the basis of their _.ĭigestion of food particles obtained from the water Sponge larvae are mobile and may swim to a new location. Which of the following is a function of the amoeboid cells of a sponge? Some sponges have internal skeletons composed of spicules. Which of the following is characteristic of sponges?ĭigestion in a sponge occurs within _. Which of the following is a germ layer that may be present during animal development?Īll animals are highly organized with tissues, organs and organ systems. ![]() The _ may have evolved separately from the rest of the animals. Segmented animals have repeating units and have more specialized parts than nonsegmented animals.Īn animal that has an internal body cavity completely lined with mesoderm is called a(n) _. Which of the following germ layers are characteristic of animals with a tissue level of organization? The phylum _ contains vertebrates and invertebrates.Īnimals without an endoskeleton of bone or cartilage are called invertebrates.Īll animals are believed to have evolved from a _ ancestor.Īnimals with radial symmetry tend to be sessile. Which of the following does not describe animals?Īn animal that has definite right and left halves has _. ![]()
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