... 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) ... continuous, and ___________ .(A) of varying thickness(B) varied thickness(C) its thickness varies(D) its thickness varying91. The holograph was an instrument employed to send signals by reflecting ... valued for the magical powers that ___________ to come from it.A) have thought B) were thinking C) have been thinking D) were thought703. M : "If someone falls into deep water and can't...