Assertion: snake | /r/CapableOf | evolve in the direction of heaviness
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Source sentences:
text: It seems likely that these snakes evolved in the direction of heaviness only after the development of a heat-sensitive depression, the loreal pit, located between the eye and the nostril, and the venom apparatus, which enabled them to stay in one place and wait for their prey, rather than engaging in a continuous active search for food.