All of the following have been suggested as triggers for the Cambrian radiation of complex metazoans except: perhaps the Cambrian metazoans outcompeted the Ediacaran metazoans, opening up new ecological niches to fill perhaps a series of fortuitsus genetic changes provided more raw material for natural selection to act upon perhaps increased oxygen in the world ocean promoted the evolution of compiex body forms perhaps the rise in sea level that flooded the margins of the continents during the earliest Paleozoic created abundant new ecological niches, promoting biodiversity perhaps the "arms race" between predator and prey spurred evolutionary innovation

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Evolutionary lineages

An evolutionary lineage is a series of populations of organisms that descend from a common ancestor. Each species in the lineage is the direct consequence of evolutionary change from a common ancestor. A phylogenetic tree is generally used to display lineages visually. Lineages are components of the phylogenetic tree of life. Molecular systematics procedures are widely used to predict lineages.