Since the color and shape of quartz varies from sample to sample, a geologist may need to examine other physical properties to properly identify the mineral.

In shallow water at the beach, manuel saw an animal whose body was protected by hard plates. its body also had radial symmetry. the animal pumped water into its tube feet to move. which invertebrate group does this animal belong to? a. mollusks b. echinoderms c. sponges d arthropods