Here's why:
* "viv-" means "alive" or "living".
* Words with this root often convey a sense of life, energy, and vitality.
Examples:
* Vivipary: The process of giving birth to live young.
* Vivacious: Full of life and spirit.
* Revive: To bring back to life or consciousness.
Therefore, if you encounter an unfamiliar word with the root "viv-", it's likely to relate to something lively, energetic, or full of life, especially when referring to creatures.