Q: When a wave travels down a string, the string vibrates up and down at right angles to the wave's what? Read this paragraph and choose the correct option from the provided answers: A: The wave travels down the string to the end. The string vibrates up and down at right angles to the direction of the wave. Choices: - frequency - pressure - gravity - direction A:
direction

Q: What causes natural ripening in fruit? Read this paragraph and choose the correct option from the provided answers: Choices: - sulfur - chloride - acid - ethylene A:
ethylene

Q: Q: All chemical reactions require what to get started? Read this paragraph and choose the correct option from the provided answers: Some chemical reactions release energy, whereas other chemical reactions absorb energy. All chemical reactions require activation energy to get started. Choices: - conductivity energy - spiked energy - primary energy - activation energy A:
A: activation energy

Question: Q: What does the coefficient in front of an element in a formula indicate? Read this paragraph and choose the correct option from the provided answers: In chemical equations, reactants and products are represented by chemical symbols and formulas. Numbers called coefficients are placed in front of the symbols and formulas to show how much of each substance is involved in the reaction. Choices: - number of atoms - place on the Periodic Table - time of the reaction - how much is involved in the reaction A:
Answer: how much is involved in the reaction

*Question*
Q: The process of getting oxygen into the body and releasing carbon dioxide is called? Read this paragraph and choose the correct option from the provided answers: The process of getting oxygen into the body and releasing carbon dioxide is called respiration . Sometimes breathing is called respiration, but there is much more to respiration than just breathing. Breathing is only the movement of oxygen into the body and carbon dioxide out of the body. The process of respiration also includes the exchange of oxygen and carbon dioxide between the blood and the cells of the body. Choices: - osmosis - persperation - precipitation - respiration A:
**Answer**
respiration

(Question)
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:
(Answer)
neurogenesis