Learn vocabulary terms and more with flashcards games and other study tools. A stretch of melting ice in the Arctic Sea that can no longer support its polar bear population D. Modified Mastering Biology 1100 Chapters 1 4 Flashcards Quizlet Large reef building colonies graceful flowing fans and even small solitary organisms. . 3 What energy flows out of an ecosystem. 2 What best describes the flow of energy in an ecosystem. 32 of the 34 phyla of metazoans live on reefs 65 of marine fishes live in reefs. Some coral reefs are in deep water. 5 What is a community in a ecosystem. 5 What are three landforms formed by wave deposition. The coral reef community is best described as a community based on animals that migrate from one area of ocean to another. 7 What is the difference between a community and an ecosystem group of answer choices. 4 What is the difference between ecosystems populations and communities.