Most of the 7,000 species of echinoderms have a type of radial symmetry called pentaradial symmerty , in which the body parts extend from the center along five spokes. These may be attached to spines that protrude through the skin. They have many small, movable extensions of the water-vascular system called tube feet , which aid in movement, feeding, respiration, and excretion. Make a drawing of the only Oklahoma representative of the Phylum Cnidaria. Describe two problems caused by parasitic roundworms.
Many invertebrates have an open circulatory system.
It is used to visually provide information to a group of people - not just one person sitting in front of a computer. Color combinations and font size must make the slides easily read from a distance. All living arthropods are placed in one of the three subphyla . A title slide with a picture of your animal and its scientific name. A slide describing the characteristics of your animal.