These are bounded opportunities, not learner attainment. Partial and blocked source requirements remain so.

• partial: Understand that the ocean has different zones depending on depth and light: the sunlight zone near the surface where most life lives, the twilight zone where light fades, and the midnight zone of total darkness

  Bounded task opportunity only; this task samples the clause using recall evidence, not full coverage or learner attainment.

• partial: Name the three main ocean zones: sunlight, twilight, and midnight

  Bounded task opportunity only; this task samples the clause using recall evidence, not full coverage or learner attainment.

• partial: Explain that light decreases with depth until it disappears completely

  Bounded task opportunity only; this task samples the clause using recall evidence, not full coverage or learner attainment.

• blocked: State that most ocean life is found in the sunlight zone because plants need light to grow

  Exact source demand not established: Canonical total darkness should mean absent sunlight, not absence of bioluminescence.; Three zones are simplified; most ocean life cannot be inferred from a light diagram. Real observation/media-dependent evidence remains conditional where required.

• partial: If {{name}} saw a diagram showing the ocean getting darker as you go deeper, could they name the three main zones and explain why most ocean animals live near the sunlit surface?

  Bounded task opportunity only; this task samples the clause using recall evidence, not full coverage or learner attainment.

• Canonical total darkness should mean absent sunlight, not absence of bioluminescence.

• Three zones are simplified; most ocean life cannot be inferred from a light diagram.