An apparent departure from the rule that species diversity increases toward lower latitudes is the decrease in species of mammals as one moves southward on the peninsula of Baja California. What factor might account for this southward decline?

A) increased intensity of competition
B) increased intensity of predation
C) increased dispersal distance from the continental source of species


Ans: C) increased dispersal distance from the continental source of species

Biology & Microbiology

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Which is not true about a crown gall tumor?

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The cells that function in phloem are:

a. vessels b. sieve elements c. adjunct cells d. sclereids e. periderm

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Which of the following characteristics is

common to bryophytes and to seedless vascular plants?

a. xylem conduction cells b. sporophyte predominant c. gametophyte predominant d. water required for fertilization e. true roots

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__________ is responsible for water movement in plants

a. Guttatiion b. Evaporation c. Transpiration d. Photosynthesis e. Cellular respiration

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