During the 1980s, wolves were reintroduced to Yellowstone National Park after decades of absence due to attempted extermination in the early part of the twentieth century
Within 20 years, not only had the wolf population increased, but there was also a dramatic increase in other species, such as aspen, cottonwood, and willow trees, beavers, warblers, insects, and fish. These changes in Yellowstone Park are examples of how important a(n) ________ can be to an ecosystem. A) keystone species
B) competitor
C) herbivore
D) parasite
A
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The function of the phloem companion cells is to
a. assist vessel members to move organic substances. b. supply potassium ions for water absorption. c. help load organic compounds into neighboring sieve tubes. d. store the organic compounds transported by the sieve tubes. e. help transport organic compounds when the sieve tubes become overloaded.
Generally, which phase of the cell cycle varies the most in length?
a. G1 b. S c. G2 d. M e. All phases are the same length among cells
A genetic family tree can more correctly be called a ________.
Fill in the blank(s) with the appropriate word(s).
Arthropod success cannot be attributed to which adaptation?
a. modified segments b. jointed appendages c. closed circulatory system d. sensory specialization e. specialized developmental stages