2 Verbs to Use for the Word viability

It is an inquiry of practical importance to the aquarian naturalist, How far the diminished pressure which they meet with in the tank, on being transferred from their lower homes to the aquarium, may influence their viability.

However, I had the authority to go to press with quotes throwing into question the viability of luxury tourism in a land where the season lasts little over four months slightly dampening the gushing tone of the article.

2 Verbs to Use for the Word  viability