shell because it is hollow and therefore represents the form of a shell which is also recognized as a shell structure
the reason why it important is thatthese structures reflict on the environment and helps us bulild object like cars, house or any kinds of thing we use in life
Mass I think because foam is not a shell structure or frame.
chairs are shell/solid structures because it is a solid and can be considered a frame
my toes
mass
Shell structure
it is a frame sturctures
a teepee is a frame structre
its a frame
its "MIXED" : shell,frame, mas. BUT u can say its shell if u didnt learn the word mixed.
mass
sheel
mass
eiffel tower is a frame structure.
shell because it is hollow and therefore represents the form of a shell which is also recognized as a shell structure
a house is an good example of a combinatin of all!