Answer the following question given this paragraph: Concentration is the number of particles of a substance in a given volume. When the concentration of reactants is higher, the reaction rate is faster. At higher concentrations, particles of reactants are crowded closer together, so they are more likely to collide and react. Did you ever see a sign like the one in Figure below ? You might see it where someone is using a tank of pure oxygen for a breathing problem. The greater concentration of oxygen in the air makes combustion rapid if a fire starts burning. Q: The number of particles of a substance in a given volume is known as? Choices: - frequency - range - mass - concentration A:
concentration
(Question)
Answer the following question given this paragraph: Field lines represent lines of force in the electric field around a charged particle. The lines bend when two particles interact. What would the lines of force look like around two negatively charged particles?. Q: What are the lines of force in the electric field around a charged particle called? Choices: - terrain lines - voltage lines - ionic zone - field lines A:
(Answer)
field lines
Ques: Answer the following question given this paragraph: Q: Metabolism is the collection of what that occur in an organism? Choices: - mechanical reactions - growth reactions - mineral reactions - chemical reactions A:
Ans: chemical reactions
(Q).
Answer the following question given this paragraph: Most reptiles reproduce sexually and have internal fertilization. Their eggs are amniotic, so they can be laid on land instead of in water. Reptiles do not have a larval stage, and their hatchlings are relatively mature. Reptile parents provide little if any care to their young. Q: Most reptile eggs can be laid on land, not in water and they are called what? Choices: - aqueous - umbilical - Transitional - amniotic A:
(A).
amniotic
Ques:Answer the following question given this paragraph: Most of the visible light on Earth comes from the sun. The sun and other stars produce light because they are so hot. They glow with light due to their extremely high temperatures. This way of producing light is called incandescence . Incandescent light bulbs also produce light in this way. When electric current passes through a wire filament inside an incandescent bulb, the wire gets so hot that it glows. Do you see the glowing filament inside the incandescent light bulb in the Figure below ?. Q: The way in which the sun produces light is called what? Choices: - tumescence - rays - photosynthesis - incandescence A:

Ans:incandescence
Answer the following question given this paragraph: 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. Q: Birds have evolved a respiratory system that enables them to fly. flying is a high-energy process and requires a lot of this? Choices: - weight - nitrogen - adaptation - oxygen A:
oxygen