What was an early selective advantage of a coelom in animals? A coelom _____
A) contributed to a hydrostatic skeleton, allowing greater range of motion
B) was a more efficient digestive system
C) allowed cephalization and the formation of a cerebral ganglion
D) allowed asexual and sexual reproduction
Answer: A
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Mutations will always decrease the activity of a gene
A. true B. false
Which of the following statements best describes the function of the xylem?
A. It transports water from the roots to the stems and leaves. B. It transports food between the leaves and the roots. C. It transports minerals from the roots to the stems and leaves. D. It transports both water and minerals from the roots to the stems and leaves. E. It transports water from roots to leaves and food from leaves to roots.
If the concentration of thyroid hormone is
high,
a. the secretion of thyroid-releasing hormone is inhibited. b. the secretion of thyroid stimulating hormone is increased. c. calcitonin production is increased. d. resting metabolism decreases. e. more than one of these occurs
Four of the five phrases below are true of Darwin
and his voyage. Select the exception. a. lasted five years b. wrote final draft of book on species c. sailed aboard the H.M.S. Beagle d. embarked from England when he was 22 years old e. visited the mainland of South America