If a fossil is encased in a stratum of sedimentary rock without any strata of volcanic rock (for example, lava or ash) nearby, then it should be _____
A) easy to determine the absolute age of the fossil, because the radioisotopes in the sediments will not have been "reset" by the heat of the igneous rocks
B) easy to determine the absolute age of the fossil, because the igneous rocks will not have physically obstructed the deposition of sediment of a single age next to the fossil
C) difficult to determine the absolute age of the fossil, because the "marker fossils" common to igneous rock will be absent
D) difficult to determine the absolute age of the fossil, because radiometric dating of sedimentary rock is less accurate than that of igneous rock
D
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Regarding the gastric cavity of the cnidarians, which of the following is true?
A. Digestion takes place in the stomach after storage in the gastric cavity. B. Excretion occurs through the same mouth opening through which food enters. C. Digestive enzymes allow the consumption of prey such as fish whole.
Which of the following is most likely to function as a defense system?
A. the integumentary system B. the musculoskeletal system C. the endocrine system D. the sensory system E. the nervous system
Recent research has indicated that for human _____, vocal pitch changes may be associated with fertility
a. males b. females c. males and females d. females during menopause e. males during puberty
The products of meiosis yield the following results: PD = 1200 TT = 750 NPD = 50 What is the recombination frequency?
What will be an ideal response?