Discover Biology (Core Topics Fourth Edition) by Michael L. Cain

By Michael L. Cain

Detect Biology is helping scholars turn into biologically literate students—to growth from technological know-how to clinical literacy.Written from the floor up for nonmajors, notice Biology is the single introductory biology textbook to offer continuously utilized beneficial properties in each one bankruptcy that not just exhibit biology’s daily relevance, yet train scholars easy methods to movement from easily realizing center organic strategies to actively utilizing these suggestions to our speedily altering global. realize Biology is helping scholars develop into biologically literate students—to development from technological know-how to clinical literacy.

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Features that are advantageous in the struggle to survive and to reproduce are known as adaptations. Because evolutionary change can explain so many of the features of living organisms—from how fast pronghorn run to the sharpness of a shark’s tooth—evolution is considered the central, unifying theme in biology. 10 Groups of Living Organisms Can Evolve Species and populations of living organisms can change over time—that is, evolve. And many of our favorite foods (as well as some of our least favorite) are products of just such evolutionary change that has been controlled by humans, through a process known as artificial selection.

Any schoolchild can distinguish between an inanimate stone and the living being who skips it across a pond. Are nanobes living things or not? Why can’t scientists agree on whether something is alive? What, in fact, is life? In this chapter we Nanobes: A Tempest in a Teapot examine these questions by considering what the characteristics of life are Are these nanobes the smallest living organisms ever discovered? Or are they and how biologists study life. not alive at all? indd 3 12/4/08 4:52:25 PM W hat is life?

The more evidence that supports a hypothesis, however, the stronger that hypothesis is deemed to be. When a prediction is not upheld, the hypothesis is reexamined and changed, or discarded. Sometimes, especially when experimental results are particularly surprising or confounding, scientists not only reconsider the hypothesis but may go back and reexamine their experiments, their predictions, and even their initial observations. In Dr. Burkholder’s case, both observation and experiments upheld the predictions, providing strong support for the hypothesis that Pfiesteria is the culprit behind the massive fish kills.

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