Q: Q: What was first discovered in songbirds that produce new neurons while learning songs? Read this paragraph and choose the correct option from the provided answers: Neurogenesis At one time, scientists believed that people were born with all the neurons they would ever have. Research performed during the last few decades indicates that neurogenesis, the birth of new neurons, continues into adulthood. Neurogenesis was first discovered in songbirds that produce new neurons while learning songs. For mammals, new neurons also play an important role in learning: about 1,000 new neurons develop in the hippocampus (a brain structure involved in learning and memory) each day. While most of the new neurons will die, researchers found that an increase in the number of surviving new neurons in the hippocampus correlated with how well rats learned a new task. Interestingly, both exercise and some antidepressant medications also promote neurogenesis in the hippocampus. Stress has the opposite effect. While neurogenesis is quite limited compared to regeneration in other tissues, research in this area may lead to new treatments for disorders such as Alzheimer's, stroke, and epilepsy. How do scientists identify new neurons? A researcher can inject a compound called bromodeoxyuridine (BrdU) into the brain of an animal. While all cells will be exposed to BrdU, BrdU will only be incorporated into the DNA of newly generated cells that are in S phase. A technique called immunohistochemistry can be used to attach a fluorescent label to the incorporated BrdU, and a researcher can use fluorescent microscopy to visualize the presence of BrdU, and thus new neurons, in brain tissue (Figure 16.20). Choices: - proteins - Brain Cord - homeostasis - neurogenesis A:
A: neurogenesis

Q: Q: Body waves and surface waves are the two major types of what, which occur during earthquakes? Read this paragraph and choose the correct option from the provided answers: There are two major types of seismic waves. Body waves travel through the Earth's interior. Surface waves travel along the ground surface. In an earthquake, body waves are responsible for sharp jolts. Surface waves are responsible for rolling motions that do most of the damage in an earthquake. Choices: - tidal waves - current waves - sound waves - seismic waves A:
A: seismic waves

Q: Q: A phase diagram plots temperature and what else? Read this paragraph and choose the correct option from the provided answers: Both temperature and pressure have an effect on the phase in which a given substance exists. A plot of temperature vs. pressure that indicates the states of matter present at each point is known as a phase diagram . Figure below shows the phase diagram for water. Choices: - friction - power - movement - pressure A:
A: pressure

Q: Q: As the temperature of water decreases what happens to the speed of the water molecules? Read this paragraph and choose the correct option from the provided answers: In the liquid state, the hydrogen bonds of water can break and reform as the molecules flow from one place to another. When water is cooled, the molecules begin to slow down. Eventually, when water is frozen to ice, the hydrogen bonds become permanent and form a very specific network (see Figure below ). Choices: - move faster - evaporate - begin to boil - slow down A:
A: slow down