[Solved] While many diseases traveled from Europe to the New World,_________ appears to have been introduced to Europe from the Americas. A)measles B)typhoid C)the common cold D)syphilis E)gonorrhea Zooxanthellae: Photosynthetic algae found in close symbiotic relationships with marine invertebrates such as corals and sea anemones. Microscopic Algae: Tiny, often unicellular algae, not visible to the naked eye, that live in water and can perform photosynthesis. Phytoplankton: Microscopic floating algae and cyanobacteria that are the base of most aquatic food webs. Compare with zooplankton. See plankton and nanoplankton. Classification: The systematic organization of living things into categories based on shared attributes or evolutionary ancestry.