That would be A. Carbon dioxide.
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The Answer is Studs.
Vertical structural
members are called Studs. This is the term which is used in construction. There
are exterior and interior walls which are framed, these walls are known as
bearing walls, and some are also non- bearing. Whenever there is foundation in
a place, after the first floor deck these bearing walls are formed.
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Replication of the bacterial chromosome
Gas exchangeis the delivery of oxygen, so im guessing it takes place in the bloodstream
B. That is not related to the Structural adaptation. And are in you in K12?