*Question*
Answer the following question given this paragraph: Electromagnetic waves on the left side of the Figure above are called radio waves. Radio waves are electromagnetic waves with the longest wavelengths. They may have wavelengths longer than a soccer field. They are also the electromagnetic waves with the lowest frequencies. With their low frequencies, they have the least energy of all electromagnetic waves. Nonetheless, radio waves are very useful. They are used for radio and television broadcasts and many other purposes. You can learn more about radio waves, including how they were discovered, at this URL: http://www. youtube. com/watch?v=al7sFP4C2TY . Q: What are electromagnetic waves with the longest wavelengths called? Choices: - channel waves - sound waves - infrared waves - radio waves A:
**Answer**
radio waves

*Question*
Answer the following question given this paragraph: Air pressure affects how high a cake rises when it bakes. Directions for cake mixes often have special high altitude instructions, like those on the label below. Explain why. Q: What affects how high a cake rises when it bakes? Choices: - air currents - air movement - current pressure - air pressure A:
**Answer**
air pressure

*Question*
Answer the following question given this paragraph: Some nonmetals are very reactive, whereas others are not reactive at all. It depends on the number of electrons in their outer energy level. Q: The number of electrons in the outer energy level determines what property of nonmetals? Choices: - density - permeability - vibration - reactivity A:
**Answer**
reactivity

*Question*
Answer the following question given this paragraph: 16.5 | Musculoskeletal System By the end of this section, you will be able to: Discuss the axial and appendicular parts of the skeletal system Explain the role of joints in skeletal movement Explain the role of muscles in locomotion The muscular and skeletal systems provide support to the body and allow for movement. The bones of the skeleton protect the body's internal organs and support the weight of the body. The muscles of the muscular system contract and pull on the bones, allowing for movements as diverse as standing, walking, running, and grasping items. Injury or disease affecting the musculoskeletal system can be very debilitating. The most common musculoskeletal diseases worldwide are caused by malnutrition, which can negatively affect development and maintenance of bones and muscles. Other diseases affect the joints, such as arthritis, which can make movement difficult and, in advanced cases, completely impair mobility. Progress in the science of prosthesis design has resulted in the development of artificial joints, with joint replacement surgery in the hips and knees being the most common. Replacement joints for shoulders, elbows, and fingers are also available. Q: Which two systems together provide support to the body and allow for movement? Choices: - muscular and nervous - skeletal and digestive - vascular and muscular - skeletal and muscular A:
**Answer**
skeletal and muscular