Ultimate source of energy for life on earth is:
A. Sun
B. Geothermal heat
C. Carbohydrates
D. Fats
E. Other organisms
Answer: A. Sun
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Refer to the paragraph about the formation of the Isthmus of Panama. If the isthmus formed gradually rather than suddenly, what pattern of genetic divergence would you expect to find in these species pairs?
A) similar percentages of difference in DNA sequence between all pairs of sister species B) greater percentage of difference in DNA sequence between species that inhabit deep water than between species that inhabit shallow water C) greater percentage of difference in DNA sequence between species that inhabit shallow water than between species that inhabit deep water
Genes that affect the __________ system often affect
behavior. Fill in the blank(s) with the appropriate word(s).
If a cell is propelled through a medium in a whip-like motion, what does it most likely possess?
a. a capsule b. cilia c. a cell wall d. a flagellum
What name is given to the bond between water molecules?
What will be an ideal response?