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Dinosaurs represented a major turn in the evolutionary development of organisms on Earth. The first dinosaurs were presu..
Mammals are a diverse group of organisms, where most of them develop their offspring within the uterus of the mother. Ov..
Multicellular organisms evolved. The first ones were likely in the form of sponges. Multicellularity led to the evolutio..
Geological periods is a study guide that cites the different geological periods on Earth's timeline. Each has a brief ov..
This lesson explores the impact of biosecurity threats, and why they need to be identified and managed. Examples to incl..