Homeostasis is the
A. dynamic interplay between events that tend to change the external environment and events that tend to keep it the same.
B. the acquisition, transformation and use of energy.
C. negative feedback loop that stimulates a response similar to the stimulus.
D. maintenance of normal internal conditions by means of self-regulating mechanisms.
Answer: D
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A student just finished a delicious breakfast of pancakes with syrup, orange juice, and Danish pastries. Because his blood sugar level has increased, the pancreas will secrete ________.
Fill in the blank(s) with the appropriate word(s).
The process by which new species originate
A. is germination. B. is extinction. C. occurred only once in Earth's history. D. is speciation. E. occurred for millions of years but is no longer occurring.
An atom having a filled valence shell is stable and unreactive
__________________ Indicate whether the statement is true or false.
All of the following can cause congenital infection or infections of the newborn EXCEPT
A) syphilis. B) gonorrhea. C) nongonococcal urethritis. D) genital herpes. E) lymphogranuloma venereum.