If populations within the same area split into species, the process is known as
A. sympatric speciation.
B. allopatric speciation.
C. racial speciation.
D. ecotypical speciation.
E. reproductive speciation.
A. sympatric speciation.
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Which of the following is the most likely explanation for the lack of a filter blocking the passage of alcohol between the maternal and fetal circulations in humans?
A) There has not been enough time to evolve such a barrier. B) Such a barrier would probably also block important molecules that need to be passed to the fetus. C) The maternal and fetal blood mix directly together in an area with many villi, so a barrier is impossible. D) Alcohol has some positive effects on the fetus, so evolution has resulted in an intermediate level of filtering that blocks all but the worst abuses of alcohol.
What other information is related to the question? Which information is most useful?
What will be an ideal response?
What is an advantage of a closed circulation over open circulation?
What will be an ideal response?
The molar mass of glucose () is 180 g/mol. Which of the following procedures should you carry out to make a 0.5 M solution of glucose? The molar mass of glucose () is 180 g/mol.
a) Dissolve 0.5 g of glucose in 1 L of water. b) Dissolve 180 g of glucose in 0.5 L of water. c) Dissolve 0.5 g of glucose in a small volume of water, and then add more water until the total volume of solution is 1 L. d) Dissolve 90 g of glucose in a small volume of water, and then add more water until the total volume of the solution is 1 L. e) Dissolve 180 g of glucose in a small volume of water, and then add more water until the total volume of the solution is 1 L.