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  3. Grade 9

Science · Grade 9

Biology

How living systems work, from DNA to ecosystems.

  • 5units
  • 20lessons
  • 14–15typical age
  • NGSSstandards

Units

  1. Unit 1: Cells and systemsStandards: HS-LS1-1, HS-LS1-2, HS-LS1-3 · 4 lessons
    1. DNA, proteins and cell structure
    2. Organ systems working together
    3. Homeostasis and feedback
    4. Cell membranes and transport
  2. Unit 2: Energy in living systemsStandards: HS-LS1-5, HS-LS1-6, HS-LS1-7 · 4 lessons
    1. Photosynthesis in detail
    2. Building large carbon molecules
    3. Cellular respiration in detail
    4. Enzymes
  3. Unit 3: GeneticsStandards: HS-LS1-4, HS-LS3-1, HS-LS3-2, HS-LS3-3 · 4 lessons
    1. Mitosis
    2. Meiosis
    3. Patterns of inheritance
    4. Genetic variation
  4. Unit 4: EvolutionStandards: HS-LS4-1, HS-LS4-2, HS-LS4-4, HS-LS4-5 · 4 lessons
    1. Evidence for common ancestry
    2. Natural selection in populations
    3. Adaptation
    4. New species and extinction
  5. Unit 5: EcologyStandards: HS-LS2-1, HS-LS2-2, HS-LS2-4, HS-LS2-6, HS-LS2-7 · 4 lessons
    1. Carrying capacity
    2. Energy pyramids
    3. Ecosystem stability
    4. Human impact and solutions

Who teaches you

Every lesson has a named AI teacher and a mentor who keeps you on track. Both are AI, and every screen says so.

  • AI Super Professor · ScienceAdrian Blackstone

    Every topic starts with something you can observe or simulate. You make a prediction, we test it, and then we build the explanation together from the evidence. Models and simple simulations do the work a lab bench would do at home.

    • Physics
    • Chemistry
    • Biology
    To understand the universe, look at the stars and at the models that explain them.
  • AI Super Mentor · ScienceDaniela Muñoz

    Adrian teaches the science lessons; I help you keep going between them. We set a weekly plan, pick a small project you care about and look at your progress together.

    • Projects
    • Data and graphs
    • Study habits
    Physics teaches us to question. Building things teaches us to answer.

How lessons run

Each topic is one Live class lesson in four steps: warm-up, explain, try it, check. The AI tutor gives hints, not answers, and waits for the learner to think.

  1. Warm-up

    A quick question to recall what you already know.

  2. Explain

    The AI tutor explains one idea at a time, in plain words.

  3. Try it

    You work a problem with hints, not answers handed over.

  4. Check

    A short check shows what stuck; a teacher sees the result.

Assessment

Short checks after each lesson and a unit check at the end of each unit. The AI drafts marks; a human teacher reviews them and signs the term.

The same year elsewhere

For orientation only: a starting check sets where lessons begin.

  • 3º ESOSpain
  • 3eFrance
  • Grade 9United States
  • Grade 9Canada (outside Québec)
  • 9. sınıfTürkiye
  • Klasse 9Germany
  • 1ª superioreItaly
  • Leerjaar 3Netherlands
  • Year 10England
  • Chūgakkō 3Japan
  • Middle 3South Korea
  • Secondary 3Singapore
  • Class 9India

First class · try it now

Sit the first class before you decide

Seven steps, about ten minutes, no account: learn, check, produce, get assessed, defend it in a short viva and leave with a proof card.

Start the first class

The same grade in other subjects

Biology · Grade 9 · Nexier School