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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A) neutralize stomach acid B) activate trypsinogen C) increase the surface area to increase the efficiency of nutrient absorption D) emulsify lipid molecules
Referring to the above diagram, the dendrites
are labeled as
a. A. b. B. c. C. d. D. e. E.
According to the figure, the alga produces the least
amount of oxygen at __________ nanometers. a. 680 b. 700 c. 400 d. 475 e. 550
At sea level the air pressure which equals 1 atmosphere is
A) 150 mm Hg. B) 100 mm Hg. C) 600 mm Hg. D) 500 mm Hg. E) 760 mm Hg.