Given a sentence, fill out the missing word with a 'no' or a number (between zero and ten). You should write the numbers with english alphabet, like: four instead of 4.

Q: Luminosity decreases by almost four orders of magnitude in approximately ____ million years.

A: five
****
Q: Birds have ____ basic types of feathers.

A: three
****
Q: Dicots have seeds with ____ cotyledons.

A:
two
****