Which two animals have no distinct circulatory system?
a. grasshopper and fish
b. grasshopper and hydra
c. hydra and fish
d. sponge and fish
e. sponge and hydra
ANSWER: e
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Which organisms form the foundation of the carbon cycle?
A) anaerobic chemolithotrophs B) chemoheterotrophs C) chemoorganotrophs D) phototrophs
Epiglottitis is a potentially life-threatening disease because the patient's airway can become completely obstructed (blocked) if not treated. Which bacterium usually causes this disease?
a. Haemophilus influenzae type B b. Corynebacterium diphtheriae c. Streptococcus pyogenes d. Type A influenza virus
Denitrifying bacteria:a
make nitrogen available for assimilation. b. decompose organic nitrogen compounds into nitrate. c. decompose organic nitrogen compounds into ammonia. d. fix nitrogen into ammonia. e. convert nitrate into atmospheric nitrogen.
Bone is what kind of tissue?