TASK DEFINITION: In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.
PROBLEM: Y are _ morphisms and g is quasi-compact and surjective.

SOLUTION: two

PROBLEM: Telescopes come in _ basic types - refractors and reflectors.

SOLUTION: two

PROBLEM: Quanta has _ mass and takes up no space, yet extends out into the universe.

SOLUTION:
no