For example, human sperm quality and fertility are reportedly declining over time (Nordstrom Joensen et al., 2009) but effects on conception rates may become obvious only when the number of fertile sperm declines to a critical level.
"People change over time.
While distinguished Canadians have accepted appointments to the Senate, the tendency of governments to use it to reward retired politicians or party operatives has, over time, made it fertile ground for political cartoonists.
This system, kept in repair over time, has created Al-Ghūṭah, a fertile belt near the city of Damascus in what would otherwise have been an arid place.
The empirical sign of this essential unity of the species over time is the ability to interbreed and produce fertile offspring, a criterion that takes precedence over similarities of anatomy or habits of life.
The many changes in this area provide scholars with a fertile research setting for studying the effects of HR on employees, teams, and organization performance over time.
In 1923, much of Australia's land was virtually unoccupied, and Bruce believed Australia had the potential to be one of the most fertile and productive nations in the world, which could sustain populations upward of 100 million over time more than 16 times the population of his time.
Over time, it lowered the bar one primary at a time and, to saturate fertile areas, added the names of every Republican in counties with the highest voter turnout in recent primaries.
This conundrum remains to be resolved, and is likely to be fertile ground for creative approaches that are tailored to location-specific circumstances and will likely evolve over time.
