Riftia tube worms make a unique kind of hemoglobin to
A. to assist in the transport of carbon dioxide.
B. transport oxygen.
C. transport hydrogen sulfide.
D. All of the choices are correct.
Answer: D
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Inhibition of the flexor muscle during the knee-jerk reflex is an example of:
A. negative feedback. B. homeostasis. C. reciprocal inhibition. D. All of the answer options are correct.
Ecosystem ecology is primarily concerned with
A. ecosystem stability. B. interactions among species. C. the synthesis of new forms of nutrients. D. patterns of species diversity. E. movement of energy and materials through organisms and their communities.
The natural habitat of the bacterium Sphingobacterium is:
a. environment. b. animal oral and respiratory flora. c. environment, cold climates. d. human normal flora.
Which of the following is a J-shaped muscular sac that serves in the temporary storage of masticated food while digestive enzymes and HCl are released to digest proteins?
A) large intestines B) colon C) stomach D) esophagus