(Q).
Q: The rate at which an unstable isotope decays is measured in a unit known as what? Choices: - full-life - staying-life - half-time - half-life A:
(A).
half-life

(Q).
Q: What is the most effective color in interrupting the nighttime portion of the photoperiod? Choices: - yellow - white light - blue light - red light A:
(A).
red light

(Q).
Q: In the stomach, which material's arrival triggers churning and the release of gastric juices? Choices: - hair - bile - acid - food A:
(A).
food