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Some male birds and mammals congregate in communal courting grounds called leks.
Illustration of an embolus floating in an artery. The embolus will become lodged in a blood vessel t
Angioplasty. One form is called balloon angioplasty, shown here. A balloon catheter is threaded into
Artery and Vein (structure)
Structure of a Sterol Rather than being made from fatty acids
The nucleus is bounded by a double membrane called the nuclear envelope