The Sahelanthropus is the earliest, dating back 7 to 6 million years. Orrorin lived about 6 million years ago, but the bodies of Ardipithecus are said to be 5.8 to 4.4 million years old.
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Flatworms, nematodes, and cnidarians (jellyfish, sea anemones, corals) do not have a circulatory system and therefore no blood. Their body cavities have no lining or liquid in them. They get nutri (...)
The field of zoology that studies sponges is known as sponge zoology. Sponges have unspecialized cells that can transform into other types and often move between major cell layers and glial cells (...)
Here are the 5 most sleeping animals: koalas. Koalas (Phascolartos cinereus) are real snorlax. a small brown bat. All bats are nocturnal and tend to sleep well. European hedgehog. Giant armadil (...)
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Secondary hypertension is associated with a disease or condition known to cause hypertension (Table 3), or the administration of therapeutic agents or ingestion of toxic substances known to cause (...)