Complete the following nuclear equation:
Tl ? 
Pb + ??
A. 
e
B. gamma ray
C. 
He
D. both A and B
E. none of the above
Answer: A
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A) shared similarities. B) how closely related they are to one another. C) their position in a hierarchy from "simple" to "complex." D) none of the above
Biological characteristics are used to divide people into ________; however science has shown there is less than 1% genetic difference among humans
A) sub-cultures B) cultures C) races D) religions
Taxonomy is the study of biological classification schemes. Indicate whether the statement is true or false
Marine animals are unable to break down water molecules to acquire oxygen, but marine plants can produce enough carbon dioxide to support its own metabolism
Indicate whether the statement is true or false