Discover biology by Michael L Cain; et al

By Michael L Cain; et al

This new textbook is designed for non-specialist classes in biology or lifestyles sciences. It covers all features of the self-discipline from cells and organisms to inhabitants and ecology. "Discover Biology" may still permit scholars taking the direction to appreciate simple organic principles and real-world functions of biology, permitting them intelligently to procedure matters pronounced within the press or skilled of their day-by-day lives. Its significant power is its skill to hide the recommendations with out wasting scholars in a mass of element

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First the diplomonads branched off, then ciliates and diatoms. It remains unclear whether ciliates or diatoms branched off first, so they are depicted as branching off simultaneously. Next the Plantae branched off, and lastly the Fungi and Animalia split apart. Each of the groups branching off the tree can be thought of as a cluster of close relatives—a lineage, just like a lineage in a human family (see Chapter 2 for more on reading evolutionary trees). Above the evolutionary tree, the kingdom to which each group belongs is shown.

The most powerful new feature being studied by systematists today is a. behavior. b. the cell. c. DNA. d. organs. PAGE PROOF: 2ND PASS 34 UNIT 1 Diversity of Life 3. Evolutionary taxonomy a. is the newest school of systematics. b. is more rigorous than cladistics. c. requires the study of DNA. d. uses no specific formula or rationale to define its methodology. 4. The most useful features for cladistic analysis are a. convergent features. b. shared ancestral features. c. shared derived features.

Members of one group, the methanogens (methano, “methane”; gen, “producer”), inhabit animal guts and produce the methane gas in such things as human flatulence (intestinal gas) and cow burps. live on sewage are used to help decompose human waste so that it can be safely and usefully returned to the environment. Bacteria also live harmlessly in animal guts (including our own), helping animals digest their food. Of course, not all prokaryotes are helpful. Many bacteria cause diseases. Some are the stuff of nightmares, such as the flesh-eating bacteria that can destroy human flesh at frightening rates.

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