Scientists investigating speciation in fruit flies divided a single population of flies into separate populations that each lived in their own cage on one of two food sources: maltose-based food or starch-based food. After several generations, the flies' mate preference was tested, and it was found that flies strongly preferred to mate with other flies that were raised on the same food source. This result suggests that
A. selection on reproductive isolating mechanisms indirectly led to the evolution of different food preferences.
B. reproductive isolating mechanisms evolved primarily through genetic drift.
C. selection on food source indirectly led to the evolution of reproductive isolating mechanisms.
D. different food preferences evolved primarily through genetic drift.
Answer: C
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Given this information from one element in the periodic table of elements, the number of neutrons and protons is
A. 7, which is also the atomic mass.
B. unable to be determined with the information provided.
C. 14, which is also the atomic mass.
D. 14, which is also the atomic number.
E. 7, which is also the atomic number.
Your friend Matti accidentally injected himself with double the correct dosage of insulin. He has collapsed. Quick! It's all up to you. What do you do?
A) Give him glucagon. B) Inject him with more insulin. C) Give him CPR. D) Inject him with thyroxine.
Which of the following evidence obtained from fossil studies is generally accepted as marking the beginning of the hominids?
A. Manufacture and use of tools B. Large brain development C. Walking upright D. Bipedalism E. Development of lower limbs longer than forelimbs
Jean-Baptiste Lamarck's process of acquired characteristics would support the idea that if you run marathons and develop very strong leg muscles, your children would be born with very strong leg muscles.
Answer the following statement true (T) or false (F)