Herron et al.'s study of Chlamydomonas supports the idea that this trait evolved to make predation more difficult. William Ratcliff's team artificially selected yeast to evolve this trait, creating "snowflake yeast." Parasitic myxozoans (MIX-uh-ZOH-enz) have a highly reduced form of this trait, lacking pathways such as Wnt (W-N-T) and (10[1])Hedgehog. Fossil organisms with this trait, such as Dickinsonia, became common in the Ediacaran period. (10[1])The evolution of this trait is researched using Dictyostelium (DIK-tee-oh-STEL-ee-um), an amoeboid slime mold that uses chemotaxis to create grexes and fruiting bodies with this trait. The spherical algae Volvox (-5[1])possesses this trait, as it has two pathways of differentiation. This trait has independently evolved at least 25 times, (-5[1])including in fungi, plants, and animals. For 10 points, name this trait of organisms being made of (10[1])many (10[6])fundamental units. ■END■