Download Cell Scientists: Discovering How Cells Work: Life Science by Kimberly Fekany Lee PDF

By Kimberly Fekany Lee

Attach content-area literacy and technology with differentiated readers that includes lab actions and profiles of comparable scientitists

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Studies of the distribution of life have revealed several fundamental patterns in the way species proliferate and are fitted together in Earth’s far-flung ecosystems. The first, the most elementary, is that bacteria and archaeans occur everywhere there is life of any kind, whether on the surface or deep beneath it. The second is that, if there is even the smallest space through which to wriggle or swim, tiny protists and invertebrates invade and proceed to prey on the microbes and one another. The third principle is that the more space available, up to and including the largest ecosystems such as grasslands and oceans, the larger are the largest animals living in them.

It may be no more than a transient film on grains of sand, it may never see sunlight, it may be boiling hot or supercooled, but there will be some kind of organism living in or upon it. Even if nothing alive is visible to the naked eye, single cells of microorganisms will be growing and reproducing there, or at least dormant and awaiting the arrival of liquid water to kick them back into activity. 3 4 CONSERVATION An extreme example is the McMurdo Dry Valleys of Antarctica, whose soils are the coldest, driest, and most nutritionally deficient in the world.

About 272,000 species have been described worldwide, but the true number is likely to be 300,000 or more. Each year about 2,000 new species are added to the world list published in botany’s standard reference work, the Index Kewensis. Even the relatively well-curried United States and Canada continue to yield about 60 new species annually. Some experts believe that as much as 5 percent of the North American flora await discovery, including 300 or more species and races in the biologically rich state of California alone.

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