- Study guides, Class notes & Summaries

National 5 Biology Unit 3 Revision Complete Solutions Abiotic Refers to physical factors, such as temperature and light intensity, that affect ecosystems. Adaptation Feature of an organism that helps it to survive. aerobic In the presence of, or involving the use of, oxygen. Algal bloom A seasonal abundance of algae. Ammonium NH4; a nitrogen-containing waste product of decomposition. Biodiversity Refers to the number and abundance of species. Biological control Natura...