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

[Q]: Happiness is _ kinds of ice cream.
[A]: two

[Q]: Tapirs have hoofed toes, with four toes on the front feet and _ toes on the hind feet.
[A]: three

[Q]: Green iguanas are handsome creatures, but they can grow up to _ feet long, and be aggressive.
[A]:
six