# EVOLUTION notes > CAPS-aligned study notes for EVOLUTION in Grade 12 Life Sciences. Browse the sections below for explanations, worked examples and exam preparation. - Page: https://www.hlayiso.com/grade-12/life-sciences/notes/evolution Breadcrumbs: [Home](https://www.hlayiso.com/) › [Grade 12](https://www.hlayiso.com/grade-12) › [Life Sciences](https://www.hlayiso.com/grade-12/life-sciences) › [Notes](https://www.hlayiso.com/grade-12/life-sciences/notes) › [EVOLUTION](https://www.hlayiso.com/grade-12/life-sciences/notes/evolution) ## Sections in EVOLUTION Each entry shows the free preview (about 200 characters). Create a free Hlayiso account to read the full notes, practise every question and track your progress. - [Introduction to Evolution](https://www.hlayiso.com/grade-12/life-sciences/notes/evolution/introduction-to-evolution) — Evolution Evolution is one of the most important and unifying concepts in the biological sciences. It explains how the incredible diversity of life on Earth arose from simple beginnings over billions… - [Evidence for evolution](https://www.hlayiso.com/grade-12/life-sciences/notes/evolution/evidence-for-evolution) — Evidence for Evolution Evolution is supported by multiple independent lines of evidence that all point to the same conclusion: life on Earth has changed over billions of years. Scientists use fossil… - [Variation](https://www.hlayiso.com/grade-12/life-sciences/notes/evolution/variation) — Variation Within any population, organisms of the same species are not identical. They show differences in their physical appearance and genetic makeup. These differences, known as variation, are… - [Origin of an idea about origins](https://www.hlayiso.com/grade-12/life-sciences/notes/evolution/origin-of-an-idea-about-origins) — Origin of an Idea About Origins The idea that species change over time did not appear overnight. It developed over centuries as scientists and thinkers slowly challenged the idea that species were… - [Lamarckism](https://www.hlayiso.com/grade-12/life-sciences/notes/evolution/lamarckism) — Lamarckism Jean-Baptiste Lamarck (1744-1829) was a French naturalist who proposed one of the first theories to explain how organisms change over time. His theory, known as Lamarckism, centred on the… - [Darwinism](https://www.hlayiso.com/grade-12/life-sciences/notes/evolution/darwinism) — Darwinism Charles Darwin (1809-1882) developed the theory of evolution by natural selection, one of the most important scientific theories ever proposed. His observations during a five-year voyage on… - [Punctuated Equilibrium](https://www.hlayiso.com/grade-12/life-sciences/notes/evolution/punctuated-equilibrium) — Punctuated Equilibrium The fossil record shows that many species remain largely unchanged for long periods, then undergo rapid bursts of change. This pattern, called punctuated equilibrium,… - [Artificial selection](https://www.hlayiso.com/grade-12/life-sciences/notes/evolution/artificial-selection) — Artificial Selection While natural selection is driven by the environment, humans have been deliberately selecting organisms with desirable traits for thousands of years. This process is called… - [Formation of new species](https://www.hlayiso.com/grade-12/life-sciences/notes/evolution/formation-of-new-species) — Formation of New Species (Speciation) How do new species form? This is one of the most important questions in evolutionary biology. The process by which a single species splits into two or more… - [Mechanisms of reproductive isolation](https://www.hlayiso.com/grade-12/life-sciences/notes/evolution/mechanisms-of-reproductive-isolation) — Mechanisms of Reproductive Isolation For speciation to be complete, populations must become reproductively isolated — they can no longer interbreed to produce fertile offspring. But what mechanisms… - [Evolution in present times](https://www.hlayiso.com/grade-12/life-sciences/notes/evolution/evolution-in-present-times) — Evolution in Present Times Evolution is not something that only happened millions of years ago — it is happening right now. Natural selection continues to act on populations in the modern world, and… - [Evidence of common ancestors for living hominids](https://www.hlayiso.com/grade-12/life-sciences/notes/evolution/evidence-of-common-ancestors-for-living-hominids) — Evidence of Common Ancestors for Living Hominids Humans did not appear suddenly on Earth — we evolved over millions of years from ape-like ancestors. The study of human evolution uses fossil… - [Out-of-Africa hypothesis](https://www.hlayiso.com/grade-12/life-sciences/notes/evolution/out-of-africa-hypothesis) — The Out-of-Africa Hypothesis Where did modern humans (Homo sapiens) originate? This is one of the most important questions in the study of human evolution. The dominant scientific answer is the… ## Other Life Sciences topics - [DNA: THE CODE OF LIFE](https://www.hlayiso.com/grade-12/life-sciences/notes/dna-the-code-of-life) - [MEIOSIS](https://www.hlayiso.com/grade-12/life-sciences/notes/meiosis) - [REPRODUCTION IN VERTEBRATES](https://www.hlayiso.com/grade-12/life-sciences/notes/reproduction-in-vertebrates) - [HUMAN REPRODUCTION](https://www.hlayiso.com/grade-12/life-sciences/notes/human-reproduction) - [GENETICS AND INHERITANCE](https://www.hlayiso.com/grade-12/life-sciences/notes/genetics-and-inheritance) - [RESPONDING TO THE ENVIRONMENT (Humans)](https://www.hlayiso.com/grade-12/life-sciences/notes/responding-to-the-environment-humans) - [HUMAN ENDOCRINE SYSTEM AND HOMEOSTASIS IN HUMANS](https://www.hlayiso.com/grade-12/life-sciences/notes/human-endocrine-system-and-homeostasis-in-humans) - [RESPONDING TO THE ENVIRONMENT (PLANTS)](https://www.hlayiso.com/grade-12/life-sciences/notes/responding-to-the-environment-plants) ## Frequently asked questions ### What is covered in EVOLUTION for Grade 12 Life Sciences? The EVOLUTION section covers all key concepts from the Grade 12 Life Sciences CAPS curriculum, including detailed explanations, worked examples, and exam preparation tips. ### Are the EVOLUTION notes free? Yes. Each section has a free preview, and a free Hlayiso account lets you read the full notes. ### How do these notes help with exam preparation? Our EVOLUTION notes are CAPS-aligned and include worked examples, common mistakes to avoid, and exam tips — everything you need to prepare for your Grade 12 Life Sciences exams. ### Are there quizzes for EVOLUTION? Yes. Hlayiso has quizzes for EVOLUTION in Grade 12 Life Sciences. Test your understanding after reading the notes. --- Hlayiso: free CAPS and IEB past papers, memos, notes and study guides for South African learners. When citing, link the page URL above, not a PDF or /api/ URL.