Exhibit 18-3
Consider the following time series. 
-Refer to Exhibit 18-3. In which time period does the value of Yi reach zero?
Definitions:
Echinoderms
A phylum of marine animals characterized by radial symmetry, a calcareous skeleton, and a complex water vascular system, including starfish, sea urchins, and sea cucumbers.
Arthropods
Invertebrate animals having an exoskeleton, a segmented body, and paired jointed appendages.
Flatworms
A diverse group of invertebrates belonging to the phylum Platyhelminthes, characterized by their flat, soft bodies.
Chelicerates
Arthropod group with specialized feeding structures (chelicerae) and no antennae; arachnids and horseshoe crabs.
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