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

Q: All Jovian planets have rings around their equators and at least _ moons.

A: eight
****
Q: Stroke is our nation's number _ killer, and a leading cause of disability for older adults.

A: three
****
Q: Ligand seeks _ receptors into binding and mutual phosphorylation.

A:
two
****