Q: Fluoride ion is widely used in water supplies to help prevent what? Choices: - rust - bacteria - chlorine taste - tooth decay A:
tooth decay

(Question)
Q: What is something that all machines must overcome? Choices: - stress - work - temperature - friction A:
(Answer)
friction

Ques: Q: What is cholera? Choices: - protein - energy - glucose - bacteria A:
Ans: bacteria

(Q).
Q: A membrane has what property if it can control what molecules or ions enter or leave the cell? Choices: - indiscreet permeability - impermeability - susceptible permeability - selective permeability A:
(A).
selective permeability

Ques:Q: What is the term for the wavelengths of light humans can see? Choices: - radiation - ultraviolet light - distinct light - visible light A:

Ans:visible light

Ques:Q: Sound navigation and ranging is an acronym for what, which is used to locate underwater objects such as submarines? Choices: - sound transmission - GPS - radar - sonar A:

Ans:
sonar