A water-vascular system that operates the tube
feet is characteristic of the
a. arthropods.
b. annelids.
c. chordates.
d. mollusks.
e. echinoderms
E
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Hydrogen sulfide production is assayed by growth in a medium containing ferric iron (Fe3+)
Indicate whether the statement is true or false.
Physicians feel that the best way to differentiate between a fibroadenoma and a malignant tumor in the breast is through _____.
A. needle aspiration B. a biopsy C. a mammogram D. an MRI scan
Ethylene oxide is
A. used as an antiseptic against anaerobes. B. sporicidal. C. only effective with high heat. D. a halogen. E. the active agent in household bleach.
Why do many non-native species, such as a prickly pear cactus brought to Australia from South America, rapidly become abundant when first introduced?
A) Non-native species increase their reproductive rate when introduced. B) The climate in the new site is more favorable than in its native site. C) The carrying capacity at the new site is higher than that at the native site. D) There are fewer predators and parasites capable of attacking the non-native species in the new site. E) Growth changes from an S-curve to a J-curve at the new site.