"I've gotten the same result over and over again!" This statement best demonstrates
A. reliability.
B. validity.
C. the placebo effect.
D. All of these statements are true.
A. reliability.
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The ancestors of modern ________ performed the oxygenic photosynthesis responsible for converting our anoxic planet to an oxygenated one.
A. Firmicutes B. Proteobacteria C. Cyanobacteria D. Crenarchaeota
This example represents what type of competition?
a. intraspecific b. interspecific
Conservation is concerned with applying scientific knowledge to prevent the loss of biodiversity. Which of the following human activities is least likely to threaten biodiversity?
A) organic farming B) habitat destruction C) overexploitation D) introduced species
Human DNA and chimpanzee DNA differ by
A) about 1%. B) about 3%. C) more than 10%. D) the same amount that human DNA differs from orangutan DNA.