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\OZ-moh-trofe\ n.

10:29am, March 13, 2014

BALANCING ACT  Early multicellular organisms that relied on nutrients diffusing into their bodies to eat may have been precursors to animals.

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An organism that eats by osmosis, relying on nutrients diffusing into its body from a higher concentration in its environment.

About 550 million years ago, ambitious aquatic fronds began growing taller and tapped into more nutrient-rich water than found at the seafloor surface. Researchers simulated fluid flow over early multicellular osmo-trophs, which may be early precursors to animals, and found that taller fronds absorbed more nutrients.

The fronds grew up to 2 meters tall at a time when oxygen levels were just beginning to rise on Earth, setting the stage for more complex life to follow, the researchers report February 3 in Current Biology

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