Ebook: AQA A-level Biology Student Guide 3

Cover; Book title; Contents; Getting the most from this book; About this book; Content Guidance; Energy transfers in and between organisms; Photosynthesis; Respiration; Energy and ecosystems; Nutrient cycles; Organisms respond to changes in their internal and external environments; Stimuli, both internal and external, are detected and lead to a response; Nervous coordination; Skeletal muscles are stimulated to contract by nerves and act as effectors; Homeostasis is the maintenance of a stable internal environment; Questions & Answers; Paper 2-type questions; Paper 3-type questions.