Who believed that disease had natural causes, e.g., "The Four Humor Theory". and that it could be cured by rational methods?
A. Asclepius
B. Fracastoro
C. Hippocrates
D. Imhotep
Ans: C. Hippocrates
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Examine Figure 21.14. If you wanted to use a molecular clock to date a relatively recent divergence event—say, one that occurred in the last 100 million years or so—which of the four types of genes would make the best clock? Why?
A. Fibrinopeptides, because they have changed the most over that time period. B. A histone gene, because it has changed relatively little over that time. C. Fibrinopeptides, because they have changed relatively little over that time. D. A histone gene, because it has changed the most over that time period. E. Hemoglobin, because of its moderate rate of change.
What type of reproductive isolation would include closely related species of orchids that never mate in the wild because they bloom at different times?
What will be an ideal response?
Which of the following apply to the demography of human populations today? (Check all that apply.)A) Our ecological footprint is decreasing.B) We are using distributed resources disproportionately-less than 20% of us use over 80% of the energy.C) We have plenty of resources still untouched.D) We use almost half of the Earth's land.E) We use over half of all renewable fresh water sources.
What will be an ideal response?
A teratogen is any drug or chemical agent that causes ____________ development in a fetus upon exposure.
a. normal b. stunted c. rapid d. abnormal