Edexcel IGCSE Biology: Double Science 复习笔记 2.2.1 Cell Structure Cell Structures Eukaryotic cells have subcellular structures contained within their cytoplasm Each cellular structure carr...
Core Practical 15: Investigating Gamma Radiation Absorption Aim of the Experiment To investigate the absorption of gamma rays by different thicknesses of lead Variables: Independent variable = Thic...
Edexcel IGCSE Biology: Double Science 复习笔记 2.1.1 Levels of Organisation Cells, Tissues, Organs & Organ Systems Cells are the basic building blocks of all living organisms Unicellular...
Edexcel IGCSE Biology: Double Science 复习笔记 1.2.5 Pathogens Types of Pathogen A pathogen is any microorganism that causes disease in another organism (e.g. in plants or animals) Many micr...
Edexcel IGCSE Biology: Double Science 复习笔记 1.2.4 Prokaryotic Organisms Prokaryotes All living organisms can be grouped or ‘classified’ using a classification system that consists of five...
Edexcel IGCSE Biology: Double Science 复习笔记 1.2.3 Eukaryotic Organisms: Fungi & Protoctists Fungi Main features of fungi: They are usually multicellular but some are single-cel...
Nuclear Decay Equations Alpha Decay An alpha particle consists of 2 protons and 2 neutrons (It is emitted from large unstable nuclei) When an alpha particle is emitted from a nucleus: The nuc...
Edexcel IGCSE Biology: Double Science 复习笔记 1.2.2 Eukaryotic Organisms: Animals & Plants Animals The main features of animals: They are multicellular Their cells contain a nucleus wit...
Edexcel IGCSE Biology: Double Science 复习笔记 1.2.1 Eukaryotic Organisms Common Features of Eukaryotic Organisms: Basics All living organisms can be grouped or 'classified' using a c...
Alpha, Beta & Gamma Particles Some elements have nuclei that are unstable This tends to be when the number of nucleons does not balance In order to become more stable, they emit particle...
Background Radiation Radiation is a natural phenomenon, with radioactive elements having always existed on Earth and in outer space However, human activity has added to the amount of radiation that...
Nuclear Fusion Fusion is defined as: Small nuclides that combine together to make larger nuclei, releasing energy Low mass nuclei (such as hydrogen and helium) can undergo fusion and release energy...
