The two phrases that help determine the meaning of the word biodiversity are:
1. After its discovery on Cordell banks, the same species was found in other waters.
2. Much of the Ocean is unexplored and undescribed, especially at depth.
The excerpt is about the new sponge that is discovered in the Cordell Bank National Marine Sanctuary. It shows that in with world many new things are remained to discovered.
Thus, the phrases are 1. After its discovery on Cordell banks, the same species was found in other waters.
2. Much of the Ocean is unexplored and undescribed, especially at depth.
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