A-Level Biology - Biodiversity: Species Diversity | Species Richness & Evenness (2026/27 exams)

⭐️ Check out our website https://www.cognito.org/ ⭐️ ** WHAT'S COVERED ** 1. What biodiversity is and how variation exists. The distinction between interspecific and intraspecific variation. 2. Key definitions associated with biodiversity. Explanations of species, ecosystem, community, habitat and niche. 3. The three main levels of biodiversity. Ecosystem diversity, species diversity and genetic diversity. 4. The components of species diversity. The difference between species richness and species evenness. ** EXAM BOARD SPECIFIC INFO ** AQA - Everything is relevant to your course! OCR - You don't need to know the difference between interspecific and intraspecific variation CIE - You don't need to know the difference between interspecific and intraspecific variation ** CHAPTERS ** 0:00 Introduction to biodiversity 0:40 Interspecific vs intraspecific variation 1:13 Definition of species 1:30 Definition of ecosystem 1:53 Definition of community 2:12 Definition of habitat 2:23 Definition of niche 2:58 The three levels of biodiversity 3:18 Ecosystem diversity 3:38 Species diversity 3:56 Genetic diversity 4:23 Species richness vs species evenness ** PLAYLISTS **    • KS3 Biology      • KS3 Chemistry      • KS3 Physics      • GCSE Maths (9-1)      • GCSE Biology (9-1)      • GCSE Chemistry (9-1)      • GCSE Physics (9-1)      • A-Level Biology   #Alevel #Biology #study #revision #school #exam #AQA #OCR #Edexcel