Which of the following most likely requires intermolecular forces?

A spider walking on the underside of a leaf must stay attached to the leaf’s surface. Intermolecular attractions between the spider’s feet and the leaf can provide that adhesion, so choice A is most likely to require intermolecular forces. The koala’s claws hold by physically gripping the tree, while falling and maintaining a rock’s shape involve gravity and forces within the solid, respectively.

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