Answer the following question given this paragraph: Warmer, lighter air is more buoyant than the cooler air above it. So the warm air rises. The cooler air is denser than the air beneath it. So it sinks down. This is convection: warm air rises, and cool air sinks. Warm fluids can undergo convection as well. This is described in the chapter Plate Tectonics . Q: What process is at work when warm air or water rises, and cool air or water sinks? Choices: - evaporation - radiation - moisture - convection A:
convection
(Question)
Answer the following question given this paragraph: Magnetite crystals of different ages and on different continents pointed to different spots. The simplest explanation is that the continents have moved. Q: Magnetite crystals of different ages and on different continents pointed to different spots. the simplest explanation is that the continents have done what? Choices: - reacted - changed - evolved - moved A:
(Answer)
moved
Ques: Answer the following question given this paragraph: Q: Small crustaceans exchange gases across thin areas of the cuticle; larger species have what to accomplish this? Choices: - noses - pores - lungs - gills A:
Ans: gills
(Q).
Answer the following question given this paragraph: Like transverse waves, longitudinal waves are mechanical waves, which means they transfer energy through a medium. Unlike transverse waves, longitudinal waves cause the particles of medium to move parallel to the direction of the wave. They are most common in springs, where they are caused by the pushing an pulling of the spring. Although the surface waves on water are transverse waves, fluids (liquids, gases, and plasmas) usually transmit longitudinal waves. Q: Two important types of waves include longitudinal waves and what other kind? Choices: - phenomena - slow - irregular - transverse A:
(A).
transverse
Ques:Answer the following question given this paragraph: culture (outside the body under optimal growing conditions), the length of the cycle is about 24 hours. In rapidly dividing human cells with a 24-hour cell cycle, the G1 phase lasts approximately nine hours, the S phase lasts 10 hours, the G2 phase lasts about four and one-half hours, and the M phase lasts approximately one-half hour. In early embryos of fruit flies, the cell cycle is completed in about eight minutes. The timing of events in the cell cycle is controlled by mechanisms that are both internal and external to the cell. Q: The timing of events in what cycle - which lasts just minutes in fruit fly embryos - is controlled by mechanisms that are both internal and external to the cell? Choices: - circadian cycle - carbon cycle - life cycle - cell cycle A:

Ans:cell cycle
Ques: Answer the following question given this paragraph: There are approximately 7 billion humans on the planet. How long would it take some bacteria to make 7 billion copies of themselves?. Q: What is the approximate population on the earth? Choices: - 9 trillion - 7.3 billion - 41 billion - 7 billion A:
Ans:
7 billion