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

[EX Q]: Glycolysis occurs in the cytoplasm and produces _ pyruvic acid.
[EX A]: two

[EX Q]: Trees can also be air layered but air layering usually takes four to _ months to be successful.
[EX A]: six

[EX Q]: Stereo cameras track the fly's movement in _ dimensions.
[EX A]:
three