Which of the following is a characteristic of annelids?
A. radial symmetry
B. cephalization
C. psuedocoelom
D. closed circulatory system
E. incomplete digestive tract
Answer: B. cephalization
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________ nucleotides are common signals in animal cells but not in plant cells.
Fill in the blank(s) with the appropriate word(s).
The rocky shore zone that has the greatest
diversity of life is the a. upper littoral. b. midlittoral. c. lower littoral. d. intertidal. e. neritic
Cleft palate is ____
a. controlled only by genetics b. a continuously distributed trait c. controlled by a single gene pair d. only transmitted from father to son e. explained by the threshold model of complex t
Suppose you have estimated the following regression: Refrigerator Salesi = ?0 + ?1Pricei + Ui. However, when presenting your results, someone in the audience claims your estimate is biased because your sample only contains sales figures for refrigerators that are priced over $300. Their point is:
A. correct. You have a selected sample on the X variable, so your estimate is biased. B. incorrect. You have a selected sample on Y variable, but this does not bias your estimate. C. correct. You have a selected sample on the Y variable, so your estimate is biased. D. incorrect. You have a selected sample on X variable, but this does not bias your estimate.