Cephalization is:
A. the development of a "head end" in an
organism.
B. the concentration of sensory organs at one
end of an animal.
C. the development of a brain.
D. All of the answer options are correct.
D
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Mutations can be
a. random. b. beneficial. c. harmful. d. heritable. e. all of these
Australia has distinctive organisms, such as egg-laying mammals and pouched mammals (marsupials),
because they have:a. an unusual climate that has triggered natural selection. b. selective conditions that have been relaxed. c. been separated and isolated from other land masses for a long period of time. d. experienced a significantly slower rate of evolutionary change. e. fewer species of organisms than most continents.
A cyclist rides her bike up a very steep hill. Which statement properly describes this example in energetic terms?
A) Potential energy is highest when the cyclist just begins to ascend the hill. B) The cyclist produces the most potential energy as she cruises down the hill's steep slope. C) Gravity provides a source of kinetic energy. D) Potential energy in food is converted to kinetic energy as the cyclist's muscles push her up the hill. E) Kinetic energy is highest when the cyclist is at the crest of the hill.
The plastids of kelps and other brown algae arose through secondary endosymbiosis. What modern organisms are most closely related to the type of cell that eventually became these plastids?
A. Chlamydomonas (a single-celled green alga) B. coccolithophorids C. cyanobacteria D. Trypanosoma (a kinetoplastid) E. dinoflagellates