Precipitation is higher in tropical regions than in temperate and polar regions
Indicate whether the statement is true or false
TRUE
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The fragmentation of very large megakaryocytes results in the production of
A. erythrocytes. B. platelets. C. leukocytes. D. globulins. E. albumins.
Which of the following statements is FALSE?
a. Ecologists use models to represent relationships between biogeochemical cycles and most ecosystems. b. The physical environment has virtually no reservoir for most elements. c. Inputs from the physical environment and recycling made possible by decomposers and detritivores maintain the nutrient reserves in an ecosystem. d. In most major ecosystems, the amount of nutrients that is cycled within the ecosystem is greater than the amount entering or leaving the ecosystem in a given year. e. Once elements are in the biological compartments of the biogeochemical cycles, they are unlikely to leave until the organism dies.
A species' chances of going extinct are increased when its geographic range is _____, its local population size is _____, and its habitat tolerance is _____.
a) restricted; small; narrow b) extensive; small; narrow c) extensive; small; broad d) restricted; small; broad e) extensive; large; narrow
A leaf primordium is initiated as a small mound of tissue on the flank of a dome-shaped shoot apical meristem. The earliest physical evidence of the site of a newly forming leaf primordium would be
a. development of chloroplasts in a surface cell of the shoot apical meristem. b. cell division in the shoot apical meristem with the newly forming walls perpendicular to the surface of the meristem. c. preprophase bands parallel to the surface of the meristem in subsurface cells of the shoot apical meristem. d. elongation of epidermal cells perpendicular to the surface of the shoot apical meristem. e. formation of stomata in the epidermal layer of the shoot apical meristem.