This density difference creates two principal levels of Earth's surface.
The four principal levels of local government are the county, township, city or town, and school district.
Once you've found your way inside the Shed, shuffled unceremoniously through an undercroft beneath the High Line, you ascend a distinctly mall-like sequence of escalators to reach the three principal levels of galleries, which themselves feel like an extension of the spec office block next door, with plasterboard walls, suspended ceilings, and already cracked concrete floors.
Life is a dynamic process, and organismal structures disclose the history of the two principal levels of biological change: evolutionary and developmental.
Towards that end, the GOs Network aims to observe DNA sequences -- the biocode -- across the principal levels of biological organization (cell, organism, ecosystem) up to the planetary genome [ 1, 2].
An overarching theme of collaboration between sectors and across the four principal levels of the Vietnamese health system (commune, district, provincial, and national) was probed through an additional series of questions.
5.5: Principals' Levels of Perception on Challenges to Implementing HFLE: Principals from Non-HFLE schools rated 6 of the 10 (or 60%) challenges higher than Principals from HFLE schools.
The genetic flow of information in the cell attains a key principal level with the translation of messenger RNA into functional protein.
And at the principal level there is far, far less of the poetic individuality that once made cast changes an event of serious significance.
The two principal static levels of performance for radio receivers are sensitivity and selectivity.
