Which of the following statements about electrons is true?
A. Electrons in atoms can be excited by light energy.
B. Electrons behave like waves.
C. Electrons have a negative charge.
D. Electrons are particles.
E. all of the above
Answer: E
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Genes mutate, ____________________ are selected, and populations____________________
Fill in the blanks with correct word
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Figure 6.10
?According to the accompanying figure, which gender is represented by the largest numbers in the later years of life in the United States, Thailand, and China? Does that make a difference for population growth? Why or why not?
Fill in the blank(s) with the appropriate word(s).
A mineral can be composed entirely of one element
Indicate whether the statement is true or false
A species has evolved an asexual mode of reproduction by having offspring develop from unfertilized eggs. Which of the following will be TRUE of this species' response to natural selection?
A) There will be more deaths from natural selection because there is no mutation. B) The species will increase in numbers because genetic variation is increased. C) There will be less genetic variation from recombination and a risk of not adapting quickly to environmental change. D) The species will compensate for loss of genetic variation by hybridizing with other species. E) There will be fewer deaths from natural selection because sexual recombination always leads to extinction.