Ques: Q: What is the condition called where pimples form on the skin? Read this paragraph and choose the correct option from the provided answers: About 85 percent of teens develop acne, like the boy in Figure below . Acne is a condition in which pimples form on the skin. It is caused by a bacterial infection. It happens when the sebaceous glands secrete too much sebum. The excess oil provides a good place for bacteria to grow. Keeping the skin clean helps prevent acne. Over-the-counter products or prescription drugs may be needed if the problem is serious or doesn't clear up on its own. Choices: - blushing - cramping - dermatitis - acne A:
Ans: acne

Ques: Q: What term simply means sensitive beyond normal levels of activation? Read this paragraph and choose the correct option from the provided answers: Hypersensitivities The word "hypersensitivity" simply means sensitive beyond normal levels of activation. Allergies and inflammatory responses to nonpathogenic environmental substances have been observed since the dawn of history. Hypersensitivity is a medical term describing symptoms that are now known to be caused by unrelated mechanisms of immunity. Still, it is useful for this discussion to use the four types of hypersensitivities as a guide to understand these mechanisms (Figure 21.28). Choices: - hyposensitivity - isosensitivity - monosensitivity - hypersensitivity A:
Ans: hypersensitivity

Ques: Q: Space telescopes avoid such problems completely since they orbit outside the what? Read this paragraph and choose the correct option from the provided answers: Telescopes on Earth all have one big problem: Incoming light must pass through the atmosphere. This blocks some wavelengths of radiation. Also, motion in the atmosphere distorts light. You see this when you see stars twinkling in the night sky. Many observatories are built on high mountains. There is less air above the telescope, so there is less interference from the atmosphere. Space telescopes avoid such problems completely since they orbit outside the atmosphere. Choices: - ozone layer - galaxy - earth's crust - atmosphere A:
Ans: atmosphere

Ques: Q: What measurement of the wave is used to determine the magnitude of an earthquake? Read this paragraph and choose the correct option from the provided answers: Seismograms contain a lot of information about an earthquake: its strength, length, and distance. Wave height is used to determine the magnitude of the earthquake. The seismogram shows the different arrival times of the seismic waves ( Figure below ). The first waves are P-waves since they are the fastest. S-waves come in next and are usually larger than P-waves. The surface waves arrive just after the S-waves. If the earthquake has a shallow focus, the surface waves are the largest ones recorded. Choices: - length - diameter - width - height A:
Ans:
height