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121 to 144 of 274 topics

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  • Science // Ecosystems & Habitats

    Food Webs & Interdependence

    Construct and interpret food webs showing the interdependence of organisms in an ecosystem, explaining how a change in one population affects others

    Ages 11 to 12Concept
  • Science // Ecosystems & Habitats

    Pollination & Pollinator Decline

    Explain the importance of insect pollination for plant reproduction and human food security, and discuss the consequences of pollinator decline

    Ages 11 to 12Concept
  • Science // Ecosystems & Habitats

    Energy Loss Between Levels

    Explain how energy is transferred between trophic levels in a food chain, why energy is lost at each stage, and use pyramids of biomass/numbers to represent…

    Ages 11 to 12Concept
  • Science // Ecosystems & Habitats

    The Water Cycle

    Describe the water cycle, tracing water through evaporation, condensation, precipitation, surface runoff, and transpiration in plants, explaining how the sun…

    Ages 11 to 12Concept
  • Science // Ecosystems & Habitats

    Extinction & Rapid Change

    Explain how environmental change can outpace a species' ability to adapt through natural selection, leading to extinction, using historical and contemporary…

    Ages 12 to 14Concept
  • Science // Ecosystems & Habitats

    The Carbon Cycle

    Describe the carbon cycle, tracing carbon through photosynthesis, respiration, feeding, decomposition, and combustion, and explain the role of each process

    Ages 12 to 13Concept
  • Science // Ecosystems & Habitats

    How Natural Selection Works

    Explain natural selection as the mechanism of evolution: heritable variation + competition for resources + differential survival and reproduction = change in…

    Ages 12 to 14Concept
  • Science // Ecosystems & Habitats

    Evidence for Evolution

    Describe the main types of evidence for evolution: the fossil record (change over time), comparative anatomy (homologous structures), and the geographic…

    Ages 12 to 14Concept
  • Science // Ecosystems & Habitats

    Species Distribution & Change

    Explain how environmental change (climate change, habitat loss, pollution) affects the distribution of species, including range shifts, local extinction, and…

    Ages 12 to 13Concept
  • Science // Ecosystems & Habitats

    Variation in Species

    Explain variation within and between species, distinguishing between continuous variation (e.g. height) and discontinuous variation (e.g. blood group), and…

    Ages 12 to 13Concept
  • Science // Ecosystems & Habitats

    Biodiversity & Resilience

    Explain what biodiversity means, why high biodiversity makes ecosystems more resilient, and describe the ways human activity threatens biodiversity (habitat…

    Ages 12 to 14Concept
  • Science // Ecosystems & Habitats

    Toxins Building Up in Food Chains

    Explain how organisms affect and are affected by their environment, including the bioaccumulation of toxic materials (e.g. pesticides, heavy metals) through…

    Ages 12 to 13Concept
  • Science // Ecosystems & Habitats

    Chromosomes, Genes & DNA

    Describe the relationship between chromosomes, genes, and DNA in heredity, including the double helix structure of DNA and the historical roles of Watson…

    Ages 12 to 13Concept
  • Science // Ecosystems & Habitats

    Genetic Mutation

    Explain genetic mutation as a random change in DNA sequence, describe causes of mutation (e.g. radiation, chemicals, copying errors), and explain that most…

    Ages 12 to 14Concept
  • Science // Ecosystems & Habitats

    Predicting Inherited Traits

    Explain how alleles are inherited in sexual reproduction and use Punnett squares to predict the probability of offspring inheriting a characteristic, including…

    Ages 13 to 14Concept
  • Science // Energy

    Energy stores and transfers

    Identify the main energy stores (kinetic, gravitational potential, elastic potential, thermal, chemical, nuclear, electromagnetic) and the pathways by which…

    Ages 11 to 12Concept
  • Science // Energy

    Energy can't be created or destroyed

    Explain the principle of conservation of energy (energy cannot be created or destroyed, only transferred between stores), and describe how energy is dissipated…

    Ages 11 to 12Concept
  • Science // Energy

    Current, voltage, and what they measure

    Understand that electric current is the rate of flow of charge (measured in amperes using an ammeter), and that potential difference (voltage) is the energy…

    Ages 11 to 12Concept
  • Science // Energy

    Static electricity and sparks

    Explain static electricity as the build-up of electric charge through friction, describe how charged objects attract or repel each other, and relate static…

    Ages 11 to 12Concept
  • Science // Energy

    Renewable vs non-renewable energy

    Distinguish between renewable energy resources (solar, wind, hydroelectric, tidal, geothermal, biomass) and non-renewable resources (coal, oil, gas, nuclear)…

    Ages 12 to 14Concept
  • Science // Energy

    Efficiency, Sankey diagrams, and work done

    Calculate energy efficiency as the ratio of useful output energy to total input energy, construct and interpret Sankey diagrams, and calculate work done using…

    Ages 12 to 13Method
  • Science // Energy

    Heating experiments and Q = mcΔT

    Plan and carry out experiments to measure energy transferred during heating, including using the equation Q = mcΔT, recording temperature changes over time, and…

    Ages 12 to 13Method
  • Science // Energy

    Conduction, convection, and radiation

    Describe and compare the three mechanisms of heat transfer — conduction (particle vibration through solids), convection (fluid movement in liquids/gases), and…

    Ages 12 to 13Concept
  • Science // Energy

    Power: watts and energy per second

    Define power as the rate of energy transfer (power = energy ÷ time, measured in watts), and compare energy transfer rates in different everyday contexts

    Ages 12 to 13Concept