We know from fossils that immense dinosaurs did exist, but why would it be impossible for an immense giant ape like King Kong to exist?

Question

BlackTom AI · Accepted Answer

The strength available to support an animal scales with cross‑sectional area, while its mass scales with volume — the square–cube law. Bone and tendon strength are proportional to cross‑sectional area (~k^2 if linear dimensions scale by k), but weight increases with volume (~k^3). Thus larger animals rapidly face much higher stresses on their limbs unless limb proportions and foot design change to compensate.

Step‑by‑step reasoning:
1) Relevant concepts: square–cube scaling, limb posture (columnar vs flexed), foot/hand morphology and load distribution, and structural loading (compression vs bending).
2) Scaling example: take an ape of linear size scaled up by k = 10. Mass ~ k^3 so mass increases by 10^3 = 1000×. Cross‑sectional area of bones ~ k^2 = 100×. Stress (force per area) ~ mass/area ~ (1000/100) = 10× higher. That means bones and muscles would need to be ten times stronger (or limbs substantially thicker) just to carry the load. Practical limb geometry, muscle attachments, and joint shapes in apes do not scale to provide that.
3) Hands and feet of apes are adapted for grasping and manipulation: relatively narrow soles, flexible digits, and joints that experience bending and torsion. Large weight‑bearing species (e.g., sauropod dinosaurs, elephants) evolved columnar, pillar‑like limbs and broad, fleshy feet that distribute compressive loads and minimize bending moments. Dinosaur limb posture and foot morphology were specialized to support huge masses; an ape’s hand/foot design could not redistribute loads likewise.

Why the correct option is correct: The core limitation is mechanical — Kong’s hands and feet (and flexed posture) would concentrate stresses and produce bending/torsion beyond tissue limits. Large dinosaurs avoided this by straight, pillar limbs and broad weight‑bearing feet.

Why other options are incorrect:
- Option 1: Semi‑sprawled stance is not the primary problem; apes already use more erect posture than sprawled reptiles. The key issue is foot/hand design and load distribution.
- Option 3: Heat dissipation and fur are secondary constraints; animals can evolve sweating, sparsely furred skin, or large ears.
- Option 4: Food requirements matter but are not the fundamental mechanical impossibility; endothermy alone doesn’t forbid large size.
- Option 5: Hollow bones occur in many theropods/birds but not all large dinosaurs; weight reduction by hollowness isn’t the decisive factor versus limb/foot support.

Conclusion: The correct answer is: "King Kong could not have survived as the design of his feet and hands could not begin to support his mass, unlike dinosaur feet." This matches the provided answer.

We know from fossils that immense dinosaurs did exist, but why would it be impossible for an immense giant ape like King Kong to exist?单项选择题

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