Which statement is the best definition of biodiversity?
The total number of organisms of one species living in an ecosystem
The variety of all the different species of organisms on Earth or in an ecosystem
The total mass of all the living organisms found in one habitat on Earth
The range of different habitats that can be found within one ecosystem
49 exam-style questions on AQA GCSE Biology 7.3 Biodiversity and the effect of human interaction on ecosystems, covering 7.3.1 Biodiversity, 7.3.2 Waste management, 7.3.3 Land use, 7.3.4 Deforestation, 7.3.5 Global warming, and 7.3.6 Maintaining biodiversity. Each one has a worked solution and a mark scheme showing where the marks go.