Ascidian Tadpole [ BEST – 2025 ]

As he flicked his muscular tail, Pip felt the power of his , a flexible rod that made him a relative of the great whales and humans. His tiny brain, a cluster of only 170 neurons, hummed with data from two specialized organs:

Pip did not eat. He had no mouth and no stomach. He was a living battery, powered only by the energy his mother had packed into his cells, and he knew—in the way a cluster of neurons can "know"—that time was running out. ascidian tadpole

A "gravity-sensor" that pulled him toward the safety of the dark seafloor. As he flicked his muscular tail, Pip felt