useless trivia: What Word Means: Magnificent?

Questions

A ---------- keeps purring, no matter if it is inhaling or exhaling, a baffling accomplishment.?

A cat uses its whiskers to determine if a space is too small to squeeze through. The whiskers act as feelers or ----------, helping the animal to judge the precise width of any passage.?

A cat's arching back is part of a complex body language system, usually associated with feeling threatened. The arch is able to get so high because the cat's spine contains nearly 60 vertebrae which fit loosely together. Humans have only ----------?

A cat's ---------- can't move sideways.?

A ---------- can advance 7 to 8 meters in a single stride, and the animal completes four strides per second. A stride is measured as the distance between successive imprints of the same paw.?