Independent experts have expressed significant doubts about the viability of the aircraft. Thus, loss of neutral red uptake corresponds to loss of cell viability. Ultrasound is also a common tool for determining viability and location of a pregnancy. There were also concerns about its financial viability and probable drain on the exchequer. There are other challenges to the project's future viability. The country was not prepared to surrender its economic viability. However, there is controversy around the economic viability of such an attack. The embryo must be alive, called seed viability. The attendant consequences on viability and population levels fell within the sphere of natural selection. Thyroid cancer risk was not associated with the number of pregnancies carried to viability. They ensure homeostasis and the viability of the human body. The congressmen expressed concerns about Western Sahara's viability. Michael becomes reluctant after reconsidering the viability of the ongoing Cuban Revolution. Critics speculate on the viability of Musil's original conception. Provide sustainment and/or long-term viability of acquired capabilities.