Mutation and ________ are the key mechanisms that generate and maintain genetic variation among individuals in most populations
A) natural selection
B) adaptations
C) asexual reproduction
D) inbreeding
E) sexual reproduction
Answer: E
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Which of the following is not a characteristic of quartz?
A. commonly occurs in six-sided crystals B. hardness of 7 C. one direction of cleavage D. conchoidal fracture E. made up of SiO2
Scientific results and hypotheses that are presented as reliable without having undergone peer review, or are discarded as a result of peer review or additional research, are considered to be ____.
A. theories B. unreliable science C. models D. scientific laws E. projections
Which if the following is (are) a way that air temperature can affect air pressure? Select all answers that apply.
a. Surface cooling causes air to become denser. b. Surface heating cause air to become less dense. c. Surface heating causes air to become denser. d. Surface cooling cause air to retain starting density.
About what percentage of all the oil that enters the oceans, worldwide, is due to human consumption?
A) 22% B) 38% C) 47% D) 53% E) 72%