Which one of the following shows a unique relationship with an insect that has coevolved with it and that is the only insect that can pollinate this tree ?

Defines symbiotic/mutualistic relationships where two species depend on each other and may occupy a niche neither could alone.

A student could apply this pattern to ask whether fig and wasp traits show reciprocal dependence (e.g., wasp life cycle inside figs, fig requiring wasp for pollination) by checking species-specific natural history.

Gives pollination as a canonical example of mutualism: a pollinator gets food and the plant gets pollinated.

Use this rule to investigate whether a particular Ficus provides exclusive rewards and whether only one insect species visits and pollinates it in field reports or species accounts.

Explains that insects are among the main agents of pollination, moving pollen between flowers.

Combine this with observation that figs have enclosed inflorescences (basic outside knowledge) to hypothesize that specialized insect pollinators (like wasps) might be required and then search for species-specific associations.

Shows how particular pollinator presence/absence can strongly affect plant seed production, implying tight dependence in some plant–insect systems.

Use this logic to predict that if a fig depends on a single wasp species, removing that wasp would reduce seed/fruit set — a testable implication via ecological studies or published experiments.

Notes high plant and insect endemism and biodiversity, implying many regionally restricted, specialized interactions can exist.

A student could combine this with geographic maps of Ficus and local insect fauna to assess whether co-occurring endemic wasp species might match particular fig species geographically (supporting species-specific coevolution).