Which one of the following is directly involved in the process of blood clotting?
A) sodium ions
B) antigen
C) fibrin
D) clotting factor XX
E) globulins
C
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Scientists examined the diversity of primary and secondary consumers from intertidal communities in four regions of the world:
Benguela along the coast of South Africa (BEN), California along the coast of North America (CAL), Humboldt along the coast of Chile in South America (HUM), and New Zealand (NZ). The number of organisms per square meter (mean density), which is a unit that represents total biomass of primary consumers (herbivores) and secondary consumers (carnivores), is plotted for each of these four regions on the graph below. Note: Image from Blanchette et al. (2009). Trophic structure and diversity in rocky intertidal upwelling ecosystems: A comparison of community patterns across California, Chile, South Africa and New Zealand. Progress in Oceanography 83: 107-116. After examining the graph, complete the following sentence. The black portion of each bar represents the percentage of [primary / secondary] consumers, whereas the gray portion of each bar designates the percentage of [primary / secondary] consumers from the four intertidal communities. What will be an ideal response?
The relationship of disease-causing organisms to an infected rabbit is one of
A. parasitism. B. commensalism. C. competition. D. herbivory. E. interference competition.
Four of the five answers listed below are
related. Select the EXCEPTION.
a. lancelet b. jawed fish c. jawless fish d. tunicate e. octopus
The right and left hemispheres of the cerebrum are connected by the:a
central sulcus. b. corpus callosum. c. substantia nigra. d. central canal. e. corpus striatum