In a __________, water, nitrogen, or carbon moves from the air, through organisms, then back to the environment.
Fill in the blank(s) with the appropriate word(s).
atmospheric cycle
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In male White-Crowned Sparrows, the sensitive period for song learning is:
A. the time during which they produce their subsong—between 50 days after hatching and about 250 days after hatching. B. the time between about 250 and 300 days after hatching, when they are producing an imperfect version of their father's song. C. about 10–50 days after hatching, when they must hear adult male song if they are later to be able to sing a proper adult male song of their own. D. the time during which, if they are presented with a live tutor of a closely related species, they can learn the other species' song instead of their own. E. the time during which, if they are presented with tapes of their own species' song and the song of a closely related species, they can learn the songs of both species.
Which feature is not found among the annelids, mollusks, flatworms, and arthropods?
a. Multicellularity b. Bilateral symmetry c. Tissues d. Radial symmetry e. Protostome development
All of the following influenced Darwin as he synthesized the theory of evolution by natural selection except _________.
A. the biogeographic distribution of species such as the mockingbirds on the Galapagos Islands B. Lyell's book Principles of Geology on the gradualness of geologic changes C. examples of artificial selection that produce rapid changes in domesticated species D. Linnaeus's hierarchical classification of species which could be interpreted as evidence of evolutionary relationships E. Mendel's paper in which he described his "laws of inheritance"
Which of the following is necessary for strong bones and teeth, nerve conduction, muscle contraction, and blood clotting?
A. sodium B. sulfur C. iron D. magnesium E. calcium