The most common cause of extinction is
A) interactions with other species.
B) limited species range.
C) habitat change.
D) overspecialization.
E) asteroid impacts.
C
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The letter “C” in the above figure represents
a. the root nodules. b. the primary root. c. the primary leaf. d. the cotyledons. e. none of these.
Algae with two flagella are
A. diatoms. B. dinoflagellates. C. cyanobacteria. D. red algae.
DNA is negatively charged because of its
A) deoxyribose molecules. B) ribose molecules. C) phosphate groups. D) bases. E) large molecular size.
Mamadou has started to experience severe pain due to kidney stones, which he has developed for the first time in his life. A bone scan shows that his bones are losing calcium at an alarming rate and becoming weakened. Based on the information in this
chapter, predict what his physician is most likely to look for. What will be an ideal response?