Plate tectonics is the theory that Earth's outer shell is divided into several plates that glide over the mantle. Plate tectonics is the theory that Earth's outer shell is divided into several plates that glide over the mantle.
The term âfutilityâ is used to refer to the inability of a clinical trial to achieve its objectives. In particular, stopping a clinical trial when the interim results suggest that it is unlikely to achieve statistical significance can save resources that could be used on more promising research.
Shares 46. Infertility is a condition of the reproductive system that prevents the conception of children. It affects approximately 10-15% of couples throughout the United States. The diagnosis of infertility is usually given to couples who have been attempting to conceive for at least 1 year without success.