Find the area of the region that is bounded by the given curve and lies in the specified sector. 
Definitions:
Common Ancestor
A hypothetical or actual species from which two or more descendant species evolved.
Choanoflagellates
A group of free-living unicellular and colonial flagellate eukaryotes considered to be the closest living relatives of animals.
Ribbon Worms
A group of soft-bodied, often very long and slender invertebrates belonging to the phylum Nemertea.
Flatworms
A phylum of simple, bilaterally symmetrical, unsegmented invertebrates with a flattened body, including planarians, flukes, and tapeworms.
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