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<html><h1>GCSE Science</h1></html>

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<span style="font-size:18px; font-weight:400;">
  <a href="/doku.php?id=gcse_biology" style="color:#16a34a; text-decoration:none;">GCSE Biology</a>
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<html>
<span style="font-size:18px; font-weight:400;">
  <a href="/doku.php?id=gcse_chemistry" style="color:#16a34a; text-decoration:none;">GCSE Chemistry</a>
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<span style="font-size:18px; font-weight:400;">
  <a href="/doku.php?id=gcse_physics" style="color:#16a34a; text-decoration:none;">GCSE Physics</a>
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  <div class="grid">
    <div class="card bio">
      <div class="pill">Biology · Word of the Day</div>
      <h2 id="bioWord">Diffusion</h2>
      <p id="bioDefinition"><strong>Definition:</strong> The net movement of particles from an area of higher concentration to an area of lower concentration.</p>
    </div>

    <div class="card chem">
      <div class="pill">Chemistry · Word of the Day</div>
      <h2 id="chemWord">Atom</h2>
      <p id="chemDefinition"><strong>Definition:</strong> The smallest part of an element that can exist and still shows that element’s chemical properties.</p>
    </div>

    <div class="card phys">
      <div class="pill">Physics · Word of the Day</div>
      <h2 id="physWord">Velocity</h2>
      <p id="physDefinition"><strong>Definition:</strong> Speed in a given direction.</p>
    </div>
  </div>
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  const biologyWords = [
    { word: "Diffusion", definition: "The net movement of particles from an area of higher concentration to an area of lower concentration." },
    { word: "Osmosis", definition: "The net movement of water molecules across a partially permeable membrane from high water concentration to low water concentration." },
    { word: "Active transport", definition: "The movement of particles from a low concentration to a high concentration, using energy from respiration." },
    { word: "Respiration", definition: "A chemical process in cells that releases energy from glucose." },
    { word: "Photosynthesis", definition: "The process by which green plants use light energy to make glucose from carbon dioxide and water." },
    { word: "Enzyme", definition: "A protein that acts as a biological catalyst, speeding up chemical reactions in living organisms." },
    { word: "Homeostasis", definition: "The regulation of internal conditions to maintain stable, optimum conditions." },
    { word: "Mutation", definition: "A random change in the DNA sequence of a gene." },
    { word: "Chromosome", definition: "A thread-like structure of DNA in the nucleus that carries genetic information." },
    { word: "Allele", definition: "A different version of the same gene." },
    { word: "Gene", definition: "A section of DNA that codes for a specific protein or characteristic." },
    { word: "DNA", definition: "The molecule that carries genetic instructions in living organisms." },
    { word: "Nucleus", definition: "The part of a cell that contains genetic material." },
    { word: "Cell membrane", definition: "A selectively permeable barrier that controls what enters and leaves the cell." },
    { word: "Cytoplasm", definition: "The jelly-like material in a cell where many chemical reactions occur." },
    { word: "Mitochondria", definition: "Cell structures where aerobic respiration takes place." },
    { word: "Ribosome", definition: "A cell structure where proteins are made." },
    { word: "Tissue", definition: "A group of similar cells that work together to carry out a specific function." },
    { word: "Organ", definition: "A structure made of different tissues working together." },
    { word: "Organ system", definition: "A group of organs working together to perform a major body function." },
    { word: "Pathogen", definition: "A microorganism that causes disease." },
    { word: "Antibody", definition: "A protein produced by white blood cells that targets specific antigens." },
    { word: "Antigen", definition: "A molecule on a pathogen that triggers an immune response." },
    { word: "Vaccine", definition: "A substance that stimulates the immune system to provide protection against disease." },
    { word: "Ecosystem", definition: "A community of organisms and the physical environment they interact with." },
    { word: "Food chain", definition: "A sequence showing how energy is transferred by eating and being eaten." },
    { word: "Biodiversity", definition: "The variety of different species in an area." },
    { word: "Natural selection", definition: "The process where organisms with advantageous traits are more likely to survive and reproduce." },
    { word: "Adaptation", definition: "A feature that helps an organism survive in its environment." },
    { word: "Extinction", definition: "The permanent loss of a species when no individuals remain." }
  ];

  const chemistryWords = [
    { word: "Atom", definition: "The smallest part of an element that can exist and still shows that element’s chemical properties." },
    { word: "Isotope", definition: "Atoms of the same element with the same number of protons but different numbers of neutrons." },
    { word: "Ion", definition: "An atom or group of atoms with an overall electric charge." },
    { word: "Covalent bond", definition: "A bond formed when atoms share pairs of electrons." },
    { word: "Ionic bond", definition: "The electrostatic attraction between oppositely charged ions." },
    { word: "Acid", definition: "A substance that produces hydrogen ions (H+) in aqueous solution." },
    { word: "Alkali", definition: "A soluble base that produces hydroxide ions (OH−) in water." },
    { word: "Neutralisation", definition: "A reaction between an acid and a base that produces salt and water." },
    { word: "Electrolysis", definition: "The decomposition of an ionic compound by passing an electric current through it." },
    { word: "Catalyst", definition: "A substance that increases the rate of a reaction without being used up." },
    { word: "Element", definition: "A pure substance made of only one type of atom." },
    { word: "Compound", definition: "A substance formed when two or more different elements are chemically bonded." },
    { word: "Mixture", definition: "Two or more substances physically combined, not chemically bonded." },
    { word: "Molecule", definition: "Two or more atoms covalently bonded together." },
    { word: "Polymer", definition: "A large molecule made from many repeating small units called monomers." },
    { word: "Monomer", definition: "A small molecule that can bond to other similar molecules to form a polymer." },
    { word: "Hydrocarbon", definition: "A compound containing only hydrogen and carbon atoms." },
    { word: "Alkane", definition: "A saturated hydrocarbon containing only single carbon-carbon bonds." },
    { word: "Alkene", definition: "An unsaturated hydrocarbon containing at least one carbon-carbon double bond." },
    { word: "Combustion", definition: "A reaction in which a substance burns in oxygen, releasing energy." },
    { word: "Oxidation", definition: "A reaction in which oxygen is gained or electrons are lost." },
    { word: "Reduction", definition: "A reaction in which oxygen is lost or electrons are gained." },
    { word: "Redox", definition: "A reaction where oxidation and reduction happen at the same time." },
    { word: "Exothermic", definition: "A reaction that transfers energy to the surroundings, usually as heat." },
    { word: "Endothermic", definition: "A reaction that takes in energy from the surroundings." },
    { word: "Precipitate", definition: "An insoluble solid formed when two solutions react." },
    { word: "Concentration", definition: "The amount of solute dissolved in a given volume of solution." },
    { word: "pH", definition: "A measure of how acidic or alkaline a solution is." },
    { word: "Relative formula mass", definition: "The sum of the relative atomic masses of all atoms in a formula." },
    { word: "Avogadro constant", definition: "The number of particles in one mole, equal to 6.02 × 10^23." }
  ];

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    { word: "Velocity", definition: "Speed in a given direction." },
    { word: "Acceleration", definition: "The rate of change of velocity." },
    { word: "Resultant force", definition: "The overall force acting on an object after all forces are combined." },
    { word: "Momentum", definition: "A measure of motion calculated as mass multiplied by velocity." },
    { word: "Power", definition: "The rate at which energy is transferred or work is done." },
    { word: "Specific heat capacity", definition: "The energy needed to raise the temperature of 1 kg of a substance by 1°C." },
    { word: "Wavelength", definition: "The distance between one point on a wave and the equivalent point on the next wave." },
    { word: "Frequency", definition: "The number of waves passing a point each second." },
    { word: "Half-life", definition: "The time taken for the activity or number of unstable nuclei in a sample to halve." },
    { word: "Current", definition: "The rate of flow of electric charge." },
    { word: "Speed", definition: "Distance travelled per unit time." },
    { word: "Distance", definition: "How much ground an object has covered." },
    { word: "Displacement", definition: "The straight-line change in position in a stated direction." },
    { word: "Scalar", definition: "A quantity with magnitude only." },
    { word: "Vector", definition: "A quantity with both magnitude and direction." },
    { word: "Inertia", definition: "The tendency of an object to resist changes in its motion." },
    { word: "Mass", definition: "A measure of how much matter is in an object." },
    { word: "Weight", definition: "The force on an object due to gravity." },
    { word: "Work done", definition: "Energy transferred when a force moves an object through a distance." },
    { word: "Kinetic energy", definition: "The energy an object has because it is moving." },
    { word: "Gravitational potential energy", definition: "Energy stored due to an object’s height in a gravitational field." },
    { word: "Efficiency", definition: "The percentage of input energy transferred usefully." },
    { word: "Potential difference", definition: "Energy transferred per unit charge between two points in a circuit." },
    { word: "Resistance", definition: "A measure of how much a component opposes the flow of current." },
    { word: "Charge", definition: "A property of matter that causes electrical effects, measured in coulombs." },
    { word: "Transformer", definition: "A device that changes the potential difference in an alternating current circuit." },
    { word: "Amplitude", definition: "The maximum displacement of a point on a wave from its rest position." },
    { word: "Refraction", definition: "The change in direction of a wave when it enters a different medium." },
    { word: "Irradiance", definition: "The power of electromagnetic radiation received per unit area." },
    { word: "Fission", definition: "The splitting of a large unstable nucleus into smaller nuclei, releasing energy." }
  ];

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