A)the extracellular space and the interstitial space.
B)the extracellular space and the intracellular space.
C)the extracellular space and the intercellular space.
D)None of the choices is correct.

A)The Cambrian saw the first animal ancestor;all animal architecture dates back to these fossils.
B)About 33 phyla evolved by the end of the Cambrian and there are now perhaps 100 phyla that have radiated from them.
C)About 100 phyla evolved by the end of the Cambrian and there are now about 33 surviving animal phyla.
D)Through the Cambrian,only non-animal ancestors existed,but after that time nearly 100 phyla evolved.

A)Line body surfaces and cavities
B)Bind and support body parts
C)Store energy (e.g. ,fat)
D)Produce blood cells