Figure 8.10   Diagram showing the evolutionary relationships and divergence times for the red, green, glaucophyte and chromist algae. These photosynthetic groups are compared with the Opisthokonta, the clade containing animals and fungi. The tree also shows two endosymbiotic events. Some time before 1.5 Ga, the fi rst such event took place, when a photosynthesizing cyanobacterium (CB) was engulfed by a eukyarote. The second endosymbiotic event involved the acquisition of a plastid about 1.3 Ga. Plastids in plants store food and may give plants color (chloroplasts are green). (Courtesy of Hwan Su Yoon.)

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