Briefly differentiate between biota, flora, and fauna
What will be an ideal response?
Answer: The definitions should be offered with the fact that flora and fauna are subdivisions of biota.
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Radium-226 is a common isotope on Earth, but has a half-life of about 1600 years. Given that Earth is some 5 billion years old, why is there any radium at all?
A. Radium-226 and Radium-218 undergo a series of transmutation reactions of alpha and beta decay to repeatedly become one another approximately every 1600 years. B. Radium-226 is a "daughter" isotope and the result of the radioactive decay of uranium. C. Radium-226 is one of several self-transmutating isotopes of the elements of the periodic table and is able to replenish itself so that it is never depleted. D. Radium-226 and Astatine-218 are converted back and forth via transmutation to one another at each of their respective half-life cycles.
Which of the following describes what infrared and visible satellite images can provide?
A. a way to distinguish between "new" and "old" clouds B. a way to determine cloud thickness and altitude C. a way to identify clouds suitable for cloud seeding D. a way to distinguish between wet and dry clouds
Which of the following is a common setting for a spring?
A) A limestone aquifer that intersects the surface B) A permeable upper layer with a water table deep below the surface C) A nonpermeable upper layer with a water table deep below the surface D) An unconfined aquifer with a water table deep below the surface
Discuss the origin of the early Earth’s hydrosphere. What will be an ideal response?