SCIENCE Coral Reefs A lesson on the characteristics of coral. Sea Jellies A lesson on the biology of sea jellies. Mollusks A lesson on the ocean animals known as mollusks (clams, snails, octopuses, and squid). Marine Environment A lesson on the plants and animals that live in various marine environments based on water depth. Environmental Issues A lesson on the current threats to the ocean environment. Echinoderms A lesson on the ocean animals known as echinoderms (sea stars, sea urchins, and sea cucumbers. The Bottom of the Food Chain A lesson and worksheet on the plants and animals at the bottom of the ocean food chain. LANGUAGE ARTS Simple Subject Review - Extra Worksheets for Subject Mastery Simple subject review. Its Either Simple or Complete - Learning about Subjects Lesson on using simple and complete subjects. Complete Subject Review: Extra Worksheets for Subject Mastery Complete subject review. The Whole Thing - Learning about Complete Subjects Learning about complete subjects. SCIENCE Ocean Waves A lesson on the physical science of ocean waves. Ocean Tides A lesson on the physical science of ocean tides. Includes lesson worksheet. Ocean Mammals A lesson on the mammals of the ocean. The Ocean Floor A lesson on the physical science of the ocean floor.