... prior to the thirteenth century. A B C D90. Au bones have an exterior layer, termed the cortex, that is smooth, dense, continuous, and ___________ .(A) of varying thickness(B) varied thickness(C) ... population of this country will be doubled in ten years' time. A B C D 305. The walls of this chapel are of solid masonry twenty-two and a half foot high and four A B C feet thick. D306. ... individual subtopics under major subject headings. A B C D219. Within the Alamo were one hundred and eighty men, more than two thirds of them had AB recently migrated from near-by states. C...