The term "smog" originally referred to a mixture of smoke and fog
Indicate whether the statement is true or false
TRUE
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In food chains, energy moves from one source to the next, resulting in a loss of usable chemical energy to the environment. What is typically the amount of chemical energy transferred between trophic levels?
A. 5% B. 10% C. 15% D. 90% E. 100%
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) Krypton is a noble gas and it may have diffused out of the sample. B) The isotope of krypton generated might have a short half-life and had undergone radioactive decay to some other element. C) Krypton is a noble gas and therefore chemically unreactive, making it difficult to characterize by chemical means. D) both A and B E) all of the above
All chordates are vertebrates
a. True b. False
Melanesia is also known as ______ Islands.
A. Small B. Black C. Many D. Indian