<p>Fig. 1. OLP 4. Tubeworms, anemones, and mussels colonize near a low-temperature hydrothermal vent. Early life forms on earth may have evolved near hydrothermal vents like this one 3.5 billion years ago.</p>

Fig. 1. OLP 4. Tubeworms, anemones, and mussels colonize near a low-temperature hydrothermal vent. Early life forms on earth may have evolved near hydrothermal vents like this one 3.5 billion years ago.

Image courtesy of National Oceanic and Atmospheric Administration (NOAA) Ocean Explorer