Answer the following question given this paragraph: Plant Life Spans The length of time from the beginning of development to the death of a plant is called its life span. The life cycle, on the other hand, is the sequence of stages a plant goes through from seed germination to seed production of the mature plant. Some plants, such as annuals, only need a few weeks to grow, produce seeds and die. Other plants, such as the bristlecone pine, live for thousands of years. Some bristlecone pines have a documented age of 4,500 years Figure 32.29. Even as some parts of a plant, such as regions containing meristematic tissuethe area of active plant growth consisting of undifferentiated cells capable of cell divisioncontinue to grow, some parts undergo programmed cell death (apoptosis). The cork found on stems, and the water-conducting tissue of the xylem, for example, are composed of dead cells. Q: Life span is distinct from what, which means the sequence of stages a plant goes through from seed germination to seed production of the mature plant? Choices: - feeding cycle - society cycle - spin cycle - life cycle A:
life cycle
Answer the following question given this paragraph: Niche is the role that a particular species plays in its ecosystem. This role includes all the ways that the species interacts with the biotic and abiotic factors in the ecosystem. Q: The role that a particular species plays in its ecosystem is also known as what? Choices: - market - type - unique - niche A:
niche
Q: Answer the following question given this paragraph: What does sunshine have to do with sleep (other than the sun shining in your eyes and waking you up)? For many people, sleeping problems have to do with an amine that the brain makes called melatonin. This compound affects the sleep-wake cycle and is affected by sunlight. During the winter, the daily cycle of melatonin production may be affected by less sunlight hours. If this cycle is changed, the person may have trouble sleeping. Melatonin supplements are available in pharmacies and health food stores and may be of help for those with sleeping problems. Q: During the winter, production of what amine involved in the sleep-wake cycle may be affected by less sunlight hours? Choices: - serotonin - dopamine - folate - melatonin A:
A: melatonin
Question: Answer the following question given this paragraph: M = dRTP Exercise Radon (Rn) is a radioactive gas formed by the decay of naturally occurring uranium in rocks such as granite. It tends to collect in the basements of houses and poses a significant health risk if present in indoor air. Many states now require that houses be tested for radon before they are sold. Calculate the density of radon at 1.00 atm pressure and 20C and compare it with the density of nitrogen gas, which constitutes 80% of the atmosphere, under the same conditions to see why radon is found in basements rather than in attics. Answer: radon, 9.23 g/L; N2, 1.17 g/L A common use of Equation 10.23 is to determine the molar mass of an unknown gas by measuring its density at a known temperature and pressure. This method is particularly useful in identifying a gas that has been produced in a reaction, and it is not difficult to carry out. A flask or glass bulb of known volume is carefully dried, evacuated, sealed, and weighed empty. It is then filled with a sample of a gas at a known temperature and pressure and reweighed. The difference in mass between the two readings is the mass of the gas. The volume of the flask is usually determined by weighing the flask when empty and when filled with a liquid of known density such as water. The use of density measurements to calculate molar masses is illustrated in Example 10. Q: Radon (rn) is a radioactive gas formed by the decay of naturally occurring uranium in rocks such as granite. it tends to collect in the basements of houses and poses a significant health risk if present in indoor air. many states now require that houses be tested for radon before they are what? Choices: - modified - seen - built - sold A:
Answer: sold
*Question*
Answer the following question given this paragraph: Q: What is the unsorted pile of material dropped by glaciers called? Choices: - icy deposit - glacial runoff - landfill - glacial till A:
**Answer**
glacial till
(Question)
Answer the following question given this paragraph: Human facial expressions can communicate a range of emotions. Q: What can human facial expressions communicate? Choices: - behaviors - ideas - theories - emotions A:
(Answer)
emotions