  It takes a mallard duck 28-30 days for the eggs to hatch. All of the eggs will hatch within 24 hours and they will then head for water.Never to return to the nest. 3 people found this useful. It takes a mallard duck 28-30 days for the eggs to hatch. All of the eggs will hatch within 24 hours and they will then head for water. Never to return to the nest. 3 people found this useful.
The two main causes of strokes are termed ischemic and hemorrhagic and involve blood vessels in the brain. Ischemic strokes comprise about 80% to 85% of all strokes. With an ischemic stroke, a blood vessel in the brain becomes clogged with a clot just like the clogged arteries in the heart. With a hemorrhagic stroke, a blood vessel in the brain actually bursts or leaks. Hemorrhagic strokes tend to be more serious.
TIA (Transient Ischemic Attack). Ischemic stroke occurs as a result of an obstruction within a blood vessel supplying blood to the brain. It accounts for 87 percent of all stroke cases. Hemorrhagic stroke occurs when a weakened blood vessel ruptures. Two types of weakened blood vessels usually cause hemorrhagic stroke: aneurysms and arteriovenous malformations (AVMs). But the most common cause of hemorrhagic stroke is uncontrolled hypertension (high blood pressure). TIA (transient ischemic attack) is caused by a temporary clot.