OCR GCSE Geography A · J383
Specification 2.1.2, 2.1.5 · Paper 2
Revise: Ecosystem Distributions and CharacteristicsA reef is built by colonies of tiny animals called coral polyps, which produce hard calcium carbonate skeletons. As colonies grow, they help form a complex structure with branches and crevices. These spaces provide food and shelter for fish, molluscs, sea urchins and sponges, supporting high biodiversity.
- Revise: Nutrient and Water Cycles in Biodiverse Ecosystems
A small coral animal. Reef-building coral polyps usually contain photosynthetic algae within their tissues.