Ais administered within a few hours after a heart attack or stroke to dissolve the damaging blood clots.?

A "beta-blocker" or clotbuster are the types of medication used to dissolve clots involved in MIs and CVAs. Remember though to be aware that two other medications that are used to prevent further clot build up are not clot busters but instead vasodilators (Nitroglycerin) or clotting antagonist (Aspirin).

Carbon-14 has a half-life of 5,730 years and most igneous rock is older than that.

Atissue is a group of connected cells that have a similar function within an organism.