Why do marine mammals look and behave similar to fish?
a) they both evolved from the same aquatic ancestor
b) they both have adapted for moving efficiently in water
c) Marine mammals learn from fish how to behave in the water
d) Both fish and marine mammals are top predators
e) Both fish and marine mammals are warm-blooded
B
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Which terrestrial ecosystem has been disturbed by human activity more than any other?
a. Desert b. tropical rainforest c. temperate deciduous forest d. coniferous forest e. shortgrass prairie
Otto Hahn and Fritz Strassmann discovered fission by bombarding uranium with neutrons. Their discovery was made possible by finding one of the fission products, barium (Ba, atomic no. = 56). What is a reasonable explanation for why they were unable to initially observe the other product, krypton (Kr, atomic no. = 36)?
A. The isotope of krypton generated might have a short half-life and had undergone radioactive decay to some other element. B. Krypton is a noble gas and therefore chemically unreactive, making it difficult to characterize by chemical means. C. Krypton is a noble gas and it may have diffused out of the sample. D. both A and B E. all of the above
Magnetometer data has been used to determine if other planets and moons in our solar system have salty oceans
a. True b. False
Although igneous rocks are the easiest to date radiometrically, most fossils are preserved in
sedimentary rocks. Indicate whether the statement is true or false.