The two main architectural systems of frame construction are a. the skeleton and the post-and lintel. b. the materials and the truss. c. the design and the architect. d. the shell and the skeleton.

The two main architectural systems of frame construction are D. the shell and the skeleton.

The shell and skeleton are two types of architectural systems used in buildings. Depending on the factors going into the building being designed, there are two different types of construction systems to use.

answer; read and consider the content of the items;

answer///supply is elastic, and demand is inelastic;