Metabolic wastes are:
a. the byproduct of metabolism.
b. unused nutrients during metabolism.
c. re-used by the organism.
d. unimportant to community metabolism.
A
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The principal advantage of air sacs in birds is that:
A. They increase the surface area through which oxygen is absorbed. B. They provide better aerodynamic lift. C. They minimize the absorption of harmful gases. D. They promote continuous flow of air through the lungs thereby enhancing metabolism by making oxygen more readily available. E. All of the choices provided are correct.
All arthropod bodies consist of all of the
following except
a. a head. b. a thorax. c. an abdomen. d. a tail. e. more than one of these
The most unique feature of the echinoderms is their:a
digestive system. b. nervous system. c. closed circulatory system. d. water vascular system. e. mantle.
What is the process that turns on the transcription of a gene or genes?
A. induction B. repression C. translation D. replication