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      <image:title>4.4.2.3 – Metabolism</image:title>
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      <image:title>4.5.1 – Homeostasis</image:title>
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    <image:image>
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      <image:title>4.5.2.1 – Structure and function</image:title>
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      <image:title>4.5.2.2 – The brain (biology only)</image:title>
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    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0956/4261/6155/files/4523-the-eye-biology-only.png?v=1776208211</image:loc>
      <image:title>4.5.2.3 – The eye (biology only)</image:title>
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    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0956/4261/6155/files/4524-control-of-body-temperature-biology-only.png?v=1776208213</image:loc>
      <image:title>4.5.2.4 – Control of body temperature (biology only)</image:title>
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      <image:title>4.5.3.1 – Human endocrine system</image:title>
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    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0956/4261/6155/files/4532-control-of-blood-glucose-concentration.png?v=1776208216</image:loc>
      <image:title>4.5.3.2 – Control of blood glucose concentration</image:title>
      <image:caption>4532 Control Of Blood Glucose Concentration</image:caption>
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    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0956/4261/6155/files/4533-maintaining-water-and-nitrogen-balance-in-the-body-biology-only.png?v=1776208218</image:loc>
      <image:title>4.5.3.3 – Maintaining water and nitrogen balance in the body (biology only)</image:title>
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    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0956/4261/6155/files/4534-hormones-in-human-reproduction.png?v=1776208219</image:loc>
      <image:title>4.5.3.4 – Hormones in human reproduction</image:title>
      <image:caption>4534 Hormones In Human Reproduction</image:caption>
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      <image:title>4.5.3.5 – Contraception</image:title>
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    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0956/4261/6155/files/4536-the-use-of-hormones-to-treat-infertility-ht-only.png?v=1776208222</image:loc>
      <image:title>4.5.3.6 – The use of hormones to treat infertility (HT only)</image:title>
      <image:caption>4536 The Use Of Hormones To Treat Infertility Ht Only</image:caption>
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      <image:title>4.5.3.7 – Negative feedback (HT only)</image:title>
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      <image:title>4.5.4.2 – Use of plant hormones (HT only)</image:title>
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      <image:title>4.3.2.4 – Limiting reactants (HT only)</image:title>
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      <image:loc>https://cdn.shopify.com/s/files/1/0956/4261/6155/files/4423-soluble-salts.png?v=1776209101</image:loc>
      <image:title>4.4.2.3 – Soluble salts</image:title>
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      <image:title>4.4.2.4 – The pH scale and neutralisation</image:title>
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      <image:loc>https://cdn.shopify.com/s/files/1/0956/4261/6155/files/4425-titrations-chemistry-only.png?v=1776209104</image:loc>
      <image:title>4.4.2.5 – Titrations (chemistry only)</image:title>
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      <image:title>4.4.2.6 – Strong and weak acids (HT only)</image:title>
      <image:caption>4426 Strong And Weak Acids Ht Only</image:caption>
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      <image:title>4.4.3.1 – The process of electrolysis</image:title>
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      <image:title>4.4.3.2 – Electrolysis of molten ionic compounds</image:title>
      <image:caption>4432 Electrolysis Of Molten Ionic Compounds</image:caption>
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      <image:title>4.4.3.3 – Using electrolysis to extract metals</image:title>
      <image:caption>4433 Using Electrolysis To Extract Metals</image:caption>
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      <image:title>4.4.3.4 – Electrolysis of aqueous solutions</image:title>
      <image:caption>4434 Electrolysis Of Aqueous Solutions</image:caption>
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      <image:title>4.4.3.5 – Representation of reactions at electrodes as half equations (HT only)</image:title>
      <image:caption>4435 Representation Of Reactions At Electrodes As Half Equations Ht Only</image:caption>
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      <image:loc>https://cdn.shopify.com/s/files/1/0956/4261/6155/files/4511-energy-transfer-during-exothermic-and-endothermic-reactions.png?v=1776209117</image:loc>
      <image:title>4.5.1.1 – Energy transfer during exothermic and endothermic reactions</image:title>
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      <image:title>4.5.1.2 – Reaction profiles</image:title>
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  <url>
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    <image:image>
      <image:loc>https://cdn.shopify.com/s/files/1/0956/4261/6155/files/4513-the-energy-change-of-reactions-ht-only.png?v=1776209120</image:loc>
      <image:title>4.5.1.3 – The energy change of reactions (HT only)</image:title>
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      <image:loc>https://cdn.shopify.com/s/files/1/0956/4261/6155/files/4521-cells-and-batteries.png?v=1776209121</image:loc>
      <image:title>4.5.2.1 – Cells and batteries</image:title>
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      <image:title>4.5.2.2 – Fuel cells</image:title>
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      <image:title>4.6.1.1 – Calculating rates of reactions</image:title>
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      <image:loc>https://cdn.shopify.com/s/files/1/0956/4261/6155/files/4612-factors-which-affect-the-rates-of-chemical-reactions.png?v=1776209126</image:loc>
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      <image:title>4.6.1.3 – Collision theory and activation energy</image:title>
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      <image:title>4.6.1.4 – Catalysts</image:title>
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      <image:title>4.6.2.1 – Reversible reactions</image:title>
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      <image:title>4.6.2.3 – Equilibrium</image:title>
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      <image:title>4.6.2.4 – The effect of changing conditions on equilibrium (HT only)</image:title>
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      <image:title>4.6.2.7 – The effect of pressure changes on equilibrium (HT only)</image:title>
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