The stomach and small intestine both contribute to digestion in a human. Which statement correctly describes how these structures are organised?
They are cells that group together to form a tissue.
They are organs that form part of an organ system.
They are organ systems that together form an organism.
They are tissues that combine to form a single organ.
34 exam-style questions on AQA GCSE Biology 2.1 Principles of organisation, covering 2.1 Principles of organisation. Each one has a worked solution and a mark scheme showing where the marks go.