To which domain of life do methanogens belong? Why are they thought to be evolutionary ancient?
What will be an ideal response?
Methanogens belong to the domain Archaea, and they are thought to be evolutionary ancient because they are found near the root of the "universal" tree of life determined by ribosomal RNA sequencing, and because they can metabolize substances, such as H2 and CO2, that are thought to have been available at the time life originated.
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Would you use a physical model or a conceptual model to describe the following: the brain, the mind, the solar system, the beginning of the universe?
A. physical, conceptual, physical, conceptual B. conceptual, physical, conceptual, physical C. physical, physical, physical, physical D. conceptual, conceptual, conceptual, conceptual
Although many rangeland managers call for sharply reducing the number of grazing livestock to reduce overgrazing, Allen Savory recommends ____.
A. moving small herds of cattle to fresh range frequently B. reseeding pasture of rangeland frequently C. exposing a small amount of land to a large herd of cattle for a few days D. frequently plowing rangeland to stimulate grass growth E. interspersing cattle range with other species of grazers, like sheep
Despite its arid climate, what environmental alterations in the state of California made it possible for this state to become one of the most important agricultural areas in the United States?
What will be an ideal response?
Which of the following describes the electromagnetic radiation that constitutes white light?
A. mixture of all types of electromagnetic radiation B. mixture of all visible wavelengths C. single short wavelength D. single long wavelength