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Reindeer antlers grow again each year under a layer of fur called velvet. This reindeer is losing th
The anterior pituitary is sometimes called the master gland because it secretes many hormones that r
Angioplasty. One form is called balloon angioplasty, shown here. A balloon catheter is threaded into
Earth’s history is divided into nested sets of time--eons, eras, periods, and epochs--and is called
Children with disabilities used to be sent to special schools. In a process called mainstreaming or ...
Cutaway Drawing of Tholos, The So-called Treasury of Atreus