An advantage of a complete digestive system over a gastrovascular cavity is that the complete system ) excludes the need for extracellular digestionb) allows for specialized regions with specialized functionsc) allows extensive branchingd) facilitates intracellular digestion

B. Allows for specialized regions with specialized functions

Explanation:

Where the complete digestive system has different specialized regions to perform specialized functions, the gastrovascular cavity is the primary organ of digestion and circulation in two major animal phyla: the Cnidaria (including jellyfish and corals) and Platyhelminthes (flatworms).

1) a

2)c

3)a

4)c

5)b

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during expiration the diaphragm relaxes, which causes the diaphragm to move downwards. the contraction of diaphragm increases the space for expansion of lungs. hence, the diaphragm relaxes and positioned downward during expiration.