What homeostatic requirement might explain why discontinuous breathing is only seen in resting insects?
A. Toxic levels of carbon dioxide can build up in active insects.
B. Resting insects have more metabolic activity.
C. Oxygen can build up in active insects.
D. Oxygen is used as quickly as it arrives in active insects.
E. Resting insects produce more carbon dioxide.
D. Oxygen is used as quickly as it arrives in active insects.
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Effective immunogens generally have a molecular weight of ________ or greater
A) 1,000 B) 5,000 C) 7,500 D) 10,000
Because it secretes substances into ducts that connect to the duodenum, the pancreas acts as an ____ gland of the digestive system
Fill in the blank with the appropriate word.
Which of the following nonpathogenic protozoa has a very large glycogen vacuole in its cyst form and measures approximately 5 to 20 µm in diameter?
a. E. coli b. I. butschlii c. E. dispar d. E. nana
A marine fish with a cold body temperature that matches its cold surroundings is an example of
A. regulating. B. conforming. C. conditioning. D. negative feedback.