A network of interactions that involves the cycling of materials and the flow of energy among organisms and their physical environment is ____.
A. a population
B. a community
C. an ecosystem
D. the biosphere
E. the habitat
Answer: C
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Monocytes and lymphocytes are agranular leukocytes.
Answer the following statement true (T) or false (F)
Materials in sedimentary cycles
a. pass through both a solid and a gaseous phase. b. are never present as gases in the ecosystem. c. are present as liquids in the earth but as gases in the atmosphere. d. pass through both a solid and a gaseous phase and are present as liquids in the earth but as gases in the atmosphere. e. exist only in solid rocks.
According to the Linnaean system of classification, the organism Acetabularia mediterranea is most closely related to
A. Mediterranea crassa. B. Acetabularia crenulata. C. Mediterranea crenulata. D. Crenulata acetabularia.
An important tool for identification of bacteria was developed by (H. C. Gram/R. Koch/S. Winogradski).
Fill in the blank(s) with the appropriate word(s).