Answer the following question given this paragraph: Fluoride ion is widely used in water supplies to help prevent tooth decay. Chloride is an important component in ion balance in blood. Iodide ion is needed by the thyroid gland to make the hormone thyroxine. Q: Fluoride ion is widely used in water supplies to help prevent what? Choices: - rust - bacteria - chlorine taste - tooth decay A:
tooth decay
(Question)
Answer the following question given this paragraph: The mechanical advantage of a simple machine such as a pulley is the factor by which the machine changes the force applied to it. The ideal mechanical advantage of a machine is its mechanical advantage in the absence of friction. All machines must overcome friction, so the ideal mechanical advantage is always somewhat greater than the actual mechanical advantage of the machine as it is used in the real world. Q: What is something that all machines must overcome? Choices: - stress - work - temperature - friction A:
(Answer)
friction
Ques: Answer the following question given this paragraph: Unsafe drinking water causes 88% of diseases worldwide. In many nations, these diseases are the leading cause of death in children under the age of five. More than 14,000 people die every day from such diseases. Cholera is caused by bacteria. A person gets guinea worm from drinking the guinea worm larvae ( Figure below ). The cholera bacteria and guinea worms are pathogens. Q: What is cholera? Choices: - protein - energy - glucose - bacteria A:
Ans: bacteria
(Q).
Answer the following question given this paragraph: Probably the most important feature of a cell's phospholipid membranes is that they are selectively permeable or semipermeable . A membrane that is selectively permeable has control over what molecules or ions can enter or leave the cell, as shown in Figure below . The permeability of a membrane is dependent on the organization and characteristics of the membrane lipids and proteins. In this way, cell membranes help maintain a state of homeostasis within cells (and tissues, organs, and organ systems) so that an organism can stay alive and healthy. 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:Answer the following question given this paragraph: Visible light is the wavelengths of light humans can see. 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:Answer the following question given this paragraph: Sonar stands for sound navigation and ranging. It is used to locate underwater objects such as submarines. 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