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Fossils of Lystrosaurus, a dicynodont therapsid, are most common in parts of modern-day South America, South Africa, Madagascar, India, South Australia, and Antarctica. The animal apparently lived in arid regions and was mostly herbivorous. It originated during the mid-Permian period, survived the Permian extinction, and dwindled by the late Triassic, though there is evidence of a relict population in Australia during the Cretaceous period. Some dicynodonts had two large tusks, extending down from their upper jaws. The tusks were not used for food gathering, and in some species were limited to males. Food was gathered using an otherwise toothless beak. Judging from the fossil record in sedimentary rocks, these pig-sized organisms were the most common mammal-like reptiles of the Permian.
What is thought to be the correct sequence of these events, from earliest to most recent, in the evolution of life on Earth?
1) origin of mitochondria
2) origin of multicellular eukaryotes
3) origin of chloroplasts
4) origin of cyanobacteria
5) origin of fungal-plant symbioses
Critical Thinking
The ability to think clearly and rationally, understanding the logical connection between ideas and critically evaluating arguments.
Scientific Inquiry
A systematic process used to investigate phenomena, acquire new knowledge, or correct and integrate previous knowledge, based on empirical evidence and the scientific method.
Inductive Reasoning
A method of reasoning in which general principles are inferred from specific observations or instances.
Empirical Reasoning
A mode of reasoning based on observed and measured phenomena and derives knowledge from actual experience.
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