Q: What is the name of the "point" that refers to the temperature at which water vapor condenses? Read this paragraph and choose the correct option from the provided answers: You've probably noticed dew on the grass on a summer morning. Why does dew form? Remember that the land heats up and cools down fairly readily. So when night comes, the land cools. Air that was warm and humid in the daytime also cools over night. As the air cools, it can hold less water vapor. Some of the water vapor condenses on the cool surfaces, such as blades of grass. The temperature at which water vapor condenses is called the dew point . If this temperature is below freezing, ice crystals of frost form instead of dew ( Figure below ). The dew point occurs at 100 percent relative humidity. Can you explain why?. Choices: - melting point - brine point - water point - dew point A:
dew point
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Q: What is cholera? Read this paragraph and choose the correct option from the provided answers: 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. Choices: - protein - energy - glucose - bacteria A:
bacteria
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Q: Prior to birth, the lungs are filled with amniotic fluid, mucus, and what else? Read this paragraph and choose the correct option from the provided answers: Birth Prior to birth, the lungs are filled with amniotic fluid, mucus, and surfactant. As the fetus is squeezed through the birth canal, the fetal thoracic cavity is compressed, expelling much of this fluid. Some fluid remains, however, but is rapidly absorbed by the body shortly after birth. The first inhalation occurs within 10 seconds after birth and not only serves as the first inspiration, but also acts to inflate the lungs. Pulmonary surfactant is critical for inflation to occur, as it reduces the surface tension of the alveoli. Preterm birth around 26 weeks frequently results in severe respiratory distress, although with current medical advancements, some babies may survive. Prior to 26 weeks, sufficient pulmonary surfactant is not produced, and the surfaces for gas exchange have not formed adequately; therefore, survival is low. Choices: - blood - plasma - air - surfactant A:
surfactant
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Q: In a tropical rainforest, where are ferns common? Read this paragraph and choose the correct option from the provided answers: Photography by Kat. Ferns are common in the understory of the tropical rainforest . CC BY 2.0. Choices: - forrest floor - emergent - canopy - understory A:
understory
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