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In ecosystems, sharks can be predators, competitors, facilitators, nutrient transporters, and food. However, overfishing and other threats have greatly reduced shark populations, altering their roles and effects on ecosystems. We review these changes and …
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[ad_1] Fossil and molecular evidence suggests that complex multicellular organisms originated and proliferated during the Neoproterozoic Era (1,000-541 million years…
[ad_1] The three newly-identified species show combinations of features not previously seen before in other living or fossil monotremes, according…
[ad_1] A gymnast can actually perform both of these types of rotation at the same time—that’s what makes the sport…