Biogeochemical cycles are crucial to ecosystem function because __________.
Fill in the blank(s) with the appropriate word(s).
Ans: nutrients and other life-sustaining molecules are in limited supply and must be continually recycled
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The cell wall of bacteria constrains the ________ that results from the osmolarity of the cytoplasmic contents.
Fill in the blank(s) with the appropriate word(s).
The Yoruba people of Africa are well known for
a. twin or triplet births. b. multiple births of 4 or more. c. high levels of FSH. d. having children well into their 70’s. e. two of these are correct.
Annual rings in a tree trunk result from
A. the alternation of xylem and phloem produced in one year. B. the proportion of wood cells and cork cells in the xylem. C. deposition of colored materials in the oldest cells. D. the kinds of cells, parenchyma or sclerenchyma, produced by the cambium. E. the variation in cell size due to different growth conditions throughout a year.
In an aquatic ecosystem, a secondary carnivore is temporarily excluded and then, after a period of time, is returned. Which one of the following is NOT an expected top-down effect after it is returned?
A. Algae decrease. B. Primary carnivores become less abundant. C. Primary productivity increases. D. Herbivores become more abundant.