Q: Q: Oxygenated air, taken in during inhalation, diffuses across the surface of the lungs into the what? Read this paragraph and choose the correct option from the provided answers: Types of Breathing Amphibians have evolved multiple ways of breathing. Young amphibians, like tadpoles, use gills to breathe, and they don't leave the water. Some amphibians retain gills for life. As the tadpole grows, the gills disappear and lungs grow. These lungs are primitive and not as evolved as mammalian lungs. Adult amphibians are lacking or have a reduced diaphragm, so breathing via lungs is forced. The other means of breathing for amphibians is diffusion across the skin. To aid this diffusion, amphibian skin must remain moist. Birds face a unique challenge with respect to breathing: They fly. Flying consumes a great amount of energy; therefore, birds require a lot of oxygen to aid their metabolic processes. Birds have evolved a respiratory system that supplies them with the oxygen needed to enable flying. Similar to mammals, birds have lungs, which are organs specialized for gas exchange. Oxygenated air, taken in during inhalation, diffuses across the surface of the lungs into the bloodstream, and carbon dioxide diffuses from the blood into the lungs and expelled during exhalation. The details of breathing between birds and mammals differ substantially. In addition to lungs, birds have air sacs inside their body. Air flows in one direction from the posterior air sacs to the lungs and out of the anterior air sacs. The flow of air is in the opposite direction from blood flow, and gas exchange takes place much more efficiently. This type of breathing enables birds to obtain the requisite oxygen, even at higher altitudes where the oxygen concentration is low. This directionality of airflow requires two cycles of air intake and exhalation to completely get the air out of the lungs. Choices: - liver - brain - proteins - bloodstream A:
A: bloodstream

Q: Q: Increasing what property of dirt would make it easier to rinse off your hands? Read this paragraph and choose the correct option from the provided answers: Dirt that gets on our hands can be difficult to remove by rinsing with cold water. What are some things that you can do to increase the solubility of dirt, making it easier to dissolve in running water?. Choices: - turbidity - density - viscosity - solubility A:
A: solubility

Q: Q: What happens when alkanes are mixed with oxygen at room temperature? Read this paragraph and choose the correct option from the provided answers: Neither positive ions nor negative ions are attracted to a nonpolar molecule. In fact, the alkanes undergo so few reactions that they are sometimes called paraffins, from the Latin parum affinis, meaning "little affinity. " Two important reactions that the alkanes do undergo are combustion and halogenation. Nothing happens when alkanes are merely mixed with oxygen (O2) at room temperature, but when a flame or spark provides the activation energy, a highly exothermic combustion reaction proceeds vigorously. For methane (CH4), the reaction is as follows:. Choices: - single replacement - redox - combustion - no reaction A:
A: no reaction

Q: Q: The vector of what organism is significant on a map showing the location of malaria? Read this paragraph and choose the correct option from the provided answers: Worldwide Distribution of Malaria. This map shows where malaria is found. The area is determined by the mosquito vector. The mosquito can live year-round only in the red-shaded areas. Choices: - virus - worm - fungi - mosquito A:
A: mosquito