Water must be warmer than ________ degrees Centigrade to support a reef of corals with zooxanthellae.
A. 15
B. 23
C. 18
D. 25
E. 30
Answer: C
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An electrical device that is "grounded" has
A. no potential difference between it and the ground. B. an infinite potential difference between it and the ground. C. low voltage. D. a firm connection to the ground.
____________________ is a non-tree plant fiber from a rapidly growing woody plant that yields more paper pulp per area of land than tree farms do
Fill in the blanks with correct word
Animals that burrow into the seafloor are members of the epifauna.
Answer the following statement true (T) or false (F)
The major adaptions that made it possible for mammals to evolve into their modern forms included all of the following except ________
A) they developed specialized limbs to adapt to a varied life style B) they became significantly larger C) they developed a more efficient respiratory system D) they developed specialized teeth to adapt to a varied diet E) their brains increased in capacity