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Unformatted text preview: with these groups has yet to fully emerge. Several organisms once placed in the protists have been moved to other Kingdoms, while others have moved from the Kingdom Fungi to the protists. Kingdom Archaezoa Organisms placed in this proposed kingdom lack mitochondria. Scientists interpret this as an indication of the divergence of this group from other "protists" prior to the endosymbiosis event that led to the development of the mitochondrion. However, some recent studies seem to indicate that some of the organisms placed in this group are secondarily mitochondrialess: their ancestors had mitochondria but lost them over time. This casts doubt on the monophyletic nature of this proposed kingdom. Members of the diplomonad subgroup of archaezoans have two flagella, two nuclei, and no mitochondria. Giardia lamblia , an intestinal parasite that causes giardiasis, is a member of this group. A colorized scanning electron migrograph of this organism is shown in Figure 4....
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