Answer the following question given this paragraph: Hot lower mantle material rises upward ( Figure below ). As it rises, it cools. At the top of the mantle it moves horizontally. Over time it becomes cool and dense enough that it sinks. Back at the bottom of the mantle, it travels horizontally. Eventually the material gets to the location where warm mantle material is rising. The rising and sinking of warm and cooler material is called convection . Q: What is the rising and sinking of warm and cooler material called? Choices: - depression - conveyance - diffusion - convection A:
convection
(Question)
Answer the following question given this paragraph: Electrical Synapse While electrical synapses are fewer in number than chemical synapses, they are found in all nervous systems and play important and unique roles. The mode of neurotransmission in electrical synapses is quite different from that in chemical synapses. In an electrical synapse, the presynaptic and postsynaptic membranes are very close together and are actually physically connected by channel proteins forming gap junctions. Gap junctions allow current to pass directly from one cell to the next. In addition to the ions that carry this current, other molecules, such as ATP, can diffuse through the large gap junction pores. There are key differences between chemical and electrical synapses. Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is unidirectional. Signaling in electrical synapses, in contrast, is virtually instantaneous (which is important for synapses involved in key reflexes), and some electrical synapses are bidirectional. Electrical synapses are also more reliable as they are less likely to be blocked, and they are important for synchronizing the electrical activity of a group of neurons. For example, electrical synapses in the thalamus are thought to regulate slow-wave sleep, and disruption of these synapses can cause seizures. Q: Although fewer in number than chemical synapses, what type of synapses are found in all nervous systems and play important and unique roles? Choices: - duplicating synapses - beginning synapses - dual synapses - electrical synapses A:
(Answer)
electrical synapses
Ques: Answer the following question given this paragraph: An electric generator is a device that changes kinetic energy to electrical energy through electromagnetic induction. Electromagnetic induction is the process of generating electric current with a magnetic field. It occurs when a magnetic field and an electric conductor, such as a coil of wire, move relative to one another. Q: What device changes kinetic energy to electrical energy through electromagnetic induction? Choices: - due generator - Emission generator - real generator - electric generator A:
Ans: electric generator
(Q).
Answer the following question given this paragraph: The temperature of the box is related to the average speed of the molecules. Use momentum principles to relate temperature to pressure. Explain conceptually, in words rather than with equations. Q: The temperature of the box is related to the average speed of what? Choices: - air - light - earth - molecules A:
(A).
molecules
Ques:Answer the following question given this paragraph: We have talked about the activity and decay of individual isotopes. In the real world, there is a decay chain that takes place until a stable end-product is produced. For U-238, the chain is a long one, with a mix of isotopes having very different half-lives. The end of the chain resides in lead, a stable element that does not decay further. Q: What is required for a decay chain to end? Choices: - stable half-life - unstable end-product - radioactive cascade - stable end-product A:

Ans:stable end-product
Question: Answer the following question given this paragraph: Q: What triggers the fight-or-flight response? Choices: - respiration - amphetamine - endorphine - epinephrine A:
Answer:
epinephrine