In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.

[Q]: Cichlids are popular in the aquarium hobby for a _ reason.
[A]: four

[Q]: Goblins are a little larger, usually _ to three feet, but sometimes much larger or smaller.
[A]: one

[Q]: Chloroplasts are larger than mitochondria, and are surrounded by _ specialized membranes.
[A]:
three