The two major groups are primate are
prosimians
and anthropoids (simians).
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The four major groups of primates are prosimians (such as lemurs and tarsiers), New World monkeys (such as spider monkeys and howler monkeys), Old World monkeys (such as baboons and macaques), and apes (such as gorillas and orangutans).
The two major groups of dinosaurs are the Saurischia (lizard-hipped dinosaurs) and the Ornithischia (bird-hipped dinosaurs). These groups are distinguished by differences in their pelvic bone structure.
metals and non-metals
The two major groups of land plants are vascular plants, which have specialized tissues for conducting water and nutrients, and non-vascular plants, which do not have these specialized tissues and are typically smaller and simpler in structure. Vascular plants include ferns, conifers, and flowering plants, while non-vascular plants include mosses and liverworts.
The two major groups of protists are protozoa (animal-like protists) and algae (plant-like protists). Protozoa are unicellular organisms that can be parasitic or free-living, while algae are photosynthetic protists that can be unicellular or multicellular.