Which of the following observations is not part of natural selection as posed by Darwin?
A. Individuals within a population differ in terms of reproductive success.
B. Individuals within a species exhibit variation.
C. Organisms compete for available resources.
D. Organisms become adapted to conditions as the environment changes.
E. All of these observations are part of natural selection as posed by Darwin.
Answer: E
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While the maximum number of electrons required to fill the outermost shell of an atom varies depending on the size of the atom, almost all of the smaller atoms (atomic numbers 2-20) are considered stable, and thus nonreactive, when they contain ________ electron(s) in the outermost shell.
A. 1 B. 8 C. 16 D. 2
Which of the following prokaryotic nutritional
groups use CO2 and inorganic substances to produce energy? a. photoautotrophs b. chemoautotrophs c. photoheterotrophs d. chemoheterotrophs e. none of these
Which of the following is the best definition of "microbial antagonism"?
A) the presence of pathogens on the surface of the skin, which will invade the body through abrasions B) the presence of normal microbiota that protect the body by competing with pathogens in a variety of ways to prevent pathogens from invading the body C) the presence of normal microbiota that can become pathogens under certain conditions D) the ability of microbiota to mutate into pathogens E) the presence of resident bacteria on the surface of the body and in cavities that connect to the surface
You and your neighbor each have a holly bush in your yards. You carefully water and care for your bush, but it fails to produce berries. Your neighbor, on the other hand, neglects his holly, yet it produces gorgeous red berries each year. Finally, in frustration, you replace your holly with a rose bush. The next year, your neighbor's holly bush has no berries at all. What happened?
A. Roses compete for the same insect pollinators as holly bushes. B. Holly plants are dioecious. Yours was a male that was needed to pollinate the neighbor's female. C. The neighbor's bush became infected with the same disease that yours had. D. Roses secrete a chemical that inhibits the reproduction of neighboring plants.