(Question)
Q: Birds have evolved a respiratory system that enables them to fly. flying is a high-energy process and requires a lot of this? Read this paragraph and choose the correct option from the provided answers: Avian Respiration Birds have evolved a respiratory system that enables them to fly. Flying is a high-energy process and requires a lot of oxygen. Furthermore, many birds fly in high altitudes where the concentration of oxygen in low. How did birds evolve a respiratory system that is so unique? Decades of research by paleontologists have shown that birds evolved from therapods, meat-eating dinosaurs (Figure 39.14). In fact, fossil evidence shows that meat-eating dinosaurs that lived more than 100 million years ago had a similar flow-through respiratory system with lungs and air sacs. Archaeopteryx and Xiaotingia, for example, were flying dinosaurs and are believed to be early precursors of birds. Choices: - weight - nitrogen - adaptation - oxygen A:
(Answer)
oxygen

(Question)
Q: When a solvent with a gas dissolved in it is heated, the kinetic energy of both the solvent and solute _________? Read this paragraph and choose the correct option from the provided answers: Several substances HCl, NH 3 , and SO 2 have solubility that decreases as temperature increases. They are all gases at standard pressure. When a solvent with a gas dissolved in it is heated, the kinetic energy of both the solvent and solute increases. As the kinetic energy of the gaseous solute increases, its molecules have a greater tendency to escape the attraction of the solvent molecules and return to the gas phase. Therefore, the solubility of a gas decreases as the temperature increases. Choices: - evaporates - generates - decreases - increases A:
(Answer)
increases

(Question)
Q: What types of living things are divided into nonvascular and vascular groupings? Read this paragraph and choose the correct option from the provided answers: The most basic division of modern plants is between nonvascular and vascular plants. Vascular plants are further divided into those that reproduce without seeds and those that reproduce with seeds. Seed plants, in turn, are divided into those that produce naked seeds in cones and those that produce seeds in the ovaries of flowers. Choices: - organs - mammals - animals - plants A:
(Answer)
plants