The standard classification system used by biologists today groups and classifies organisms on the basis of similar physical traits. This system was first developed by Carl Linnaeus
At the time of his work, there were other methods for grouping organisms that were based on similar habitats, similar diets, or similar behaviors. Why is the Linnaen system still useful to biologists today? A) This system is the simplest; the others are too complicated.
B) This system classifies based on shared traits and infers evolutionary relationships.
C) This system included all organisms found on Earth.
D) This system relies on Latin names that make the most sense to biologists.
B
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The cells primarily involved in all immune responses are the
A. erythrocytes. B. platelets. C. osteocytes. D. leukocytes.
. Destruction of forest ecosystems in Brazil affects the amount of CO2 taken up from the atmosphere. In
consequence, altered levels of atmospheric CO2 may affect the climate in the American midwest. A person who studies these types of interactions would probably be called a(n) _____.
a. biosphere biologist b. community biologist c. ecosystem biologist d. physiological ecologist e. population biologist
Diagram the hydrological cycle. Include the terms evaporation, transpiration, percolation,
groundwater, runoff, condensation, and precipitation. What will be an ideal response?
A given photon of light may trigger an action potential with thousands of times more energy because the signal strength is amplified by _____
A) the receptor B) a G protein C) a signal transduction pathway D) triggering several receptors at once