The carbon cycle in ecosystems
The carbon cycle in ecosystems

An ecosystem is a community of organisms interacting with the abiotic environment, and a population is all the organisms of one species in a habitat at one time. Carbon matters because it is built into carbohydrates, lipids, proteins and nucleic acids.
Step-by-step lessons on Edexcel A A Level Biology Evolution, carbon cycle and sustainable management. Each one builds up to exam-style questions. Build a strong foundation in cell biology and biochemistry early on, since later topics on genetics, ecology and physiology all draw on these core concepts.