In MacArthur and Wilson's island biogeography model, species richness is a balance between

A. immigration and extinction.
B. inhibition and facilitation.
C. emigration and speciation.
D. tolerance and inhibition.
E. speciation and extinction.


A. immigration and extinction.

Biology & Microbiology

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Answer the question using the accompanying figure. In the figure, letter A represents a ____ taxon, which includes ____

a. polyphyletic; species from different evolutionary lineages

b. polyphyletic; an ancestral species and all of its descendants c. paraphyletic; an ancestral species and only some of its descendants d. monophyletic; species from different evolutionary lineages e. monophyletic; an ancestral species and all of its descendants

Biology & Microbiology

Which of the following statements concerning archaea in the microbiome is correct?

A. The human body is a hostile environment for archaea. B. Archaea evolved under extreme conditions and are not commensal with humans. C. Archaeal infections are treated with translation inhibitors, as their ribosomes are the same as bacterial ribosomes. D. Methanogens are associated with anaerobic regions of the gut and the gingival pockets.

Biology & Microbiology

Who is usually credited with the discovery of penicillin?

A. Ehrlich B. Florey and Chain C. Fleming D. Duchesne

Biology & Microbiology

Which animal belongs to a subgroup of arthropods

different from that of the other four? a. horseshoe crab b. shrimp c. mite d. spider e. scorpion

Biology & Microbiology