Which kind of trait is needed by members of a population that are able to survive when environmental conditions change and, in doing so, alter the makeup of that population over time?
A. genetic
B. personality
C. character
D. innate
Answer: A
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Why is calcium fluoride, CaF2, a high melting point crystalline solid while stannic chloride, SnCl4, is a volatile liquid?
A) There is no theory to predict the physical property of melting point. Melting point temperatures are empirically determined. B) Actually, we would predict these results to be the opposite. Since each metal is combined with a group 17 halogen, the heavier metal (tin) combination should have the higher melting point. C) CaF2 is a small, linear, non-polar molecule, while SnCl4 is a huge tetrahedral structure. Therefore the bonds in calcium fluoride tend to give it a higher melting point temperature. D) Ionic compounds formed by elements on opposite sides of the periodic table, like CaF2, tend to have higher melting points than more covalently bonded structures, like SnCl4.
So far, the Arctic region has been free of air pollution
Indicate whether the statement is true or false
Briefly explain dose-response analysis
What will be an ideal response?
What is a result of European colonialism?
A) political and regional boundaries around the world B) forced movement of millions of Africans C) wealth derived from resource exploitation in Asia and Africa D) all of the above E) none of the above