Biology: The Unity and Diversity of Life (MindTap Course List)
Biology: The Unity and Diversity of Life (MindTap Course List)
15th Edition
ISBN: 9781337408332
Author: Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr
Publisher: Cengage Learning
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Chapter 45, Problem 1CT

With antibiotic resistance rising, researchers are looking for ways to reduce use of these drugs. Some cattle once fed antibiotic-laced food now get probiotic feed that can bolster population of helpful bacteria in the animal's gut. The idea is that if a large population of beneficial bacteria is in place, then harmful bacteria cannot become established or thrive. Which ecological principle is guiding this practice?

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Explain Why  bacteria do not cause food-borne illness until they are allowed to grow and increase their population density to a threshold number, like when being left out at room temperature for 12 hours or more.    What happens as the bacteria grow in numbers?  What do pathogenic bacteria synthesize?      How do bacteria know what their population density is?
The term “ecology” is derived from the Greek meaning “house” or “place to live.” However, as used by scientists, the term “ecology” is not the same as “environment.” How do these terms differ?
How are abiotic factors important in the process of natural selection?         The abiotic factors of an environment include nonliving things that affect where the organism lives. The conditions or environment where an organism lives is the base for an organism making adaptations. If they are well adapted, they will survive; if not, they will not survive.          The abiotic factors are the plants that live in the ecosystem. If the organism can feed off the plants, it will survive. If it cannot find a food source, it will not survive.          The abiotic factors are the species within the ecosystem that compete for resources. The organisms that are able to obtain these factors will survive; those that are not will not survive.          The abiotic factors are the number of predators present in the ecosystem where the organism lives. If the organism can fend off the predator, it will survive.
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