Structures for Survival

Activities to try

1. 1

   Build a survival argument workbench

   Why it works: A good argument is not just a true-sounding statement: the evidence must describe the actual structure and the reasoning must explain how its function produces a survival (or growth/behaviour/reproduction) benefit. Rejecting a plausible but disconnected chain and rebuilding a connected one is where the argumentation skill is felt.

   1. Choose an organism (for example a cactus, a polar bear, or an owl) and observe its structures from a real specimen, photo, or labelled diagram.
   2. Pick one structure (for example cactus spines, thick fur, or sharp talons) and assemble a three-part argument: a CLAIM ('the cactus's spines help it survive'), EVIDENCE ('spines are sharp, narrow, and cover the stem'), and REASONING ('they stop animals eating the cactus and their small surface area reduces water loss, so the cactus survives the hot, dry desert').
   3. Test whether each slot genuinely connects: does the evidence describe the structure, and does the reasoning explain how that function gives a survival benefit?
   4. Spot and reject tempting broken chains that pair the right structure with the wrong benefit, then rebuild a chain that actually links the structure to a survival advantage.
   5. Repeat with at least one INTERNAL structure (for example heart → pumps blood to deliver oxygen and food → keeps the animal alive) so structure is not equated only with visible external parts.
2. 2

   Question-and-answer with a field biologist

   Why it works: Argumentation is dialogic: being pressed for evidence and mechanism, and handling counter-examples, strengthens reasoning and exposes assertions that don't actually connect.

   1. Present a structure-function claim about an organism to a partner, teacher, or in-role 'field biologist' character.
   2. Respond to probing follow-ups: 'And how does that help it survive?', 'What's your evidence?', 'Would broad flat leaves be better or worse in the desert — argue your case.'
   3. Defend or revise the argument when offered a counter-example (for example: 'What if we moved the cactus to a wet rainforest — would its structures still be an advantage? Why?').
   4. Extend the reasoning to an internal structure of an animal, linking it to survival in the same step-by-step way.
3. 3

   Observe real structures and reveal their functions

   Why it works: Building accurate structure→function knowledge, grounded in observation, gives learners the evidence base their arguments will rest on, and shows that internal organs are structures with survival functions too.

   1. Examine real or pictured organisms (plant and animal) and locate specific structures: thorns, claws, waxy leaves, roots, heart, lungs.
   2. For each, record what the structure is/does and the survival role it serves, sorting structures into internal versus external.
   3. Check and correct common misconceptions (for example, that spines make food the way leaves do, or that cacti generally store their water in their roots, when most cacti store water mainly in the stem).