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.
Infertility is the inability to become pregnant after twelve months of regular, unprotected intercourse or the inability to carry a pregnancy to live birth. For women age 35 and older, testing for causes of infertility is recommended after six months of trying to become pregnant without success. Infertility affects both men and women, leading to difficulty conceiving for about one in eight couples.