The bony movable ?ap that covers the gills and gill slits is called the
(a) operculum.
(b) cranium.
(c) tympanum.
(d) colon.
(a) operculum.
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Known to cause an inflammatory bowel disease referred to as Johne's disease in cattle, sheep, and goats, which organism has been isolated from the bowel mucosa of patients with Crohn dis-ease?
a. M. paratuberculosis b. M. avium-intracellulare c. Mycobacterium phlei d. Mycobacterium lepraemurium
In arid terrestrial environments, salt can accumulate in the soil because of
A. the selective uptake of water by plants. B. the activities of grazing animals. C. the precipitation of salt from dry air. D. the secretion of salt by plants. E. the settlement and evaporation of water.
Red blood cells are derived from endoderm.
Answer the following statement true (T) or false (F)
Monocots and eudicots differ in how xylem and phloem are distributed in ground tissue, in the number of petals in flowers, and in the number of ____________________.
Fill in the blank(s) with the appropriate word(s).