What is the most important factor that controls the seasonal distribution of rain in the Tropical Savanna Climate (Aw)?
A. the strength of the westerlies
B. north-south migration of the Intertropical Convergence Zone and the Subtropical High
C. the movement of the subpolar low
D. the leeward rainshadow effect
Answer: B. north-south migration of the Intertropical Convergence Zone and the Subtropical High
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If molecular techniques predict the phylogeny shown here, which of the following shows the expected order of appearance of species in the fossil record from earliest appearing to most recently appearing?
A. chara, liverworts, hornworts, lycophytes B. chara, lycophytes, liverworts, hornworts C. lycophytes, hornworts, liverworts, chara D. lycophytes, liverworts, hornworts, chara E. hornworts, chara, lycophytes, liverworts
Adaptive radiation is
a. the basis of radiometric dating. b. development of similar body form in unrelated organisms. c. formation of beneficial alleles through exposure to radiation. d. origin of many species from a single common ancestor. e. spread of successful alleles from one population to another.
Toxoplasma gondii infects the brain, as do many other pathogens. However, Toxoplasma differs from other pathogens in that it
A. causes tumor formation in the brain. B. manifests in behavioral changes in the host. C. causes destruction of brain tissue. D. always kills the host.
A characteristic that is common to cnidarians is:
A) a medusa stage in the life cycle. B) stinging cells. C) that they create coral reefs. D) a complete digestive tract. E) an osculum.