(Question)
Q: The minimum amount necessary for self-sustained fission of a given nuclide is called what? Choices: - its half-life - its molar mass - its activation energy - its critical mass A:
(Answer)
its critical mass

(Question)
Q: In single-celled organisms, plasma membrane extensions, such as whip-like flagella or brush-like cilia, aid in what? Choices: - sensation - sound - pressure - movement A:
(Answer)
movement

(Question)
Q: The breasts contain what to give milk to feed a baby? Choices: - sebaceous glands - primordial glands - fetal glands - mammary glands A:
(Answer)
mammary glands