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

[EX Q]: Beavers have an average of _ young once a year.
[EX A]: four

[EX Q]: Degradation is a result of _ simultaneous processes.
[EX A]: two

[EX Q]: Food chains vary in length from three to _ or more levels.
[EX A]:
six