What are the differences between primary and secondary succession?
What will be an ideal response?
Primary succession involves the invasion of living organisms in an area that had no previous existing community or soil. Soil forms from the erosion of rock material in which plants can establish and spread throughout the ecosystem. Over time, a climax community forms, complete with plants, animals, fungi, and bacterial species. Secondary succession occurs when an established ecosystem is cleared either by human activity or by natural processes. Secondary succession involves opportunistic species such as grasses, weeds, and shrubs that invade and establish. If the ecosystem is not disturbed, then these plants will eventually be outcompeted by other plants.
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In most animals, the gut or digestive tract can be thought of as:
A. the stomach, small intestine, and large intestine. B. the pouch in which digestion occurs. C. the small and large intestines, along with the anus. D. the tube that runs from the animal's mouth to its anus. E. the esophagus, stomach, and large and small intestines.
Define aneuploidy and describe the sex chromosome aneuploidies involved in Turner syndrome, Klinefelter syndrome, and XYY syndrome; list characteristics of each disorder
What will be an ideal response?
Water held behind a dam would best reflect ______.
A. heat energy B. mechanical energy C. chemical energy D. potential energy E. kinetic energy
Cotyledons and endosperm both provide nutrition. What is the difference between them?
A) Cotyledons provide nutrition for the developing embryo; endosperm provides nutrition for the young seedling. B) Endosperm provides nutrition for the developing embryo; cotyledons provide nutrition for the young seedling. C) Cotyledons are found only in flowering plants; endosperm is found only in young ferns. D) Endosperm is found only in monocots; cotyledons are found only in dicots. E) Endosperm is always photosynthetic; cotyledons are usually not.