To find the least and greatest number of fish in the aquarium with 32 different habitats, where each habitat has between 15 and 24 fish, we can calculate as follows:
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Least number of fish: If each habitat has the minimum of 15 fish: \[ \text{Least number of fish} = 32 \text{ habitats} \times 15 \text{ fish/habitat} = 480 \text{ fish} \]
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Greatest number of fish: If each habitat has the maximum of 24 fish: \[ \text{Greatest number of fish} = 32 \text{ habitats} \times 24 \text{ fish/habitat} = 768 \text{ fish} \]
Therefore, the least and greatest number of fish that the aquarium could have is 480 fish and 768 fish.
The correct response is: 480 fish and 768 fish.