Bacteria (Eubacteria) Prokaryotes Archaea (Archaebacteria) Various other protist groups (e.g., protozoa, other algae, slime molds) Red algae Eukaryotes Green algae Plants Fungi Animals Figure 1.6 Ricklefs, Ecology: The Economy of Nature, 8e, © 2018 W. H. Freeman and Company Figure 1.6 The evolution of life on Earth. Bacteria are the oldest forms of life on Earth. The engulfing of one bacterial species by another led to the rise of eukaryotes containing cell organelles such as mitochondria and chloroplasts. Protists

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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.