Read the following sentence from the section
"Skeletal System."
A vertebrate has a sturdy internal
frame of bones, or a skeleton, that is
centered around the backbone.
What does the word "frame" suggest as it is
used in the sentence?
А
an outline that gives order to the body

B
a structure that supports the whole body

C an arrangement that is unique to each body

D
a plan that sets the boundaries for the body