The nature of these structures has been much disputed.
And all three structures may be converted one into the other (Schimper).
here structures have been observed which resemble nuclei in some of their characteristics.
After this came the Great Depression, which so overwhelmed the social support structures that Americans turned to the government for help and have never turned back.
No man was ever more honored in the character of his raisers than I. They are destined, I trust, to assist at the raising of loftier structures one day.