Uranium-235, with a half-life of 713,000,000 years, decays to lead-207
If a rock sample is determined to have one-quarter of the uranium-235 content it had when it formed, the age of the rock sample can be estimated to be approximately ________ years old. A) 178 million
B) 713 million
C) 28.5 billion
D) 1.4 billion
D
You might also like to view...
The two major forms of carbon that remain following microbial degradation are
A) methane, organic matter, and fossil fuels. B) methane and carbon dioxide. C) lignin and fossil fuels. D) organic matter and hydrocarbons.
Which one of the following is maintained during a chemical reaction?
A. the number of atoms present in the reactants B. the identity of the atoms present in the reactants C. the arrangement of chemical bonds present in the reactants D. the number and identity of the atoms present in the reactants E. the number and identity of the atoms, and the arrangement of chemical bonds present in the reactants.
Which adaptation allows potential prey to hide from predators by having similar physical appearance to another less desirable animal?
a. mimicry b. camouflage c. warning coloration d. color changing abilities
TRAIT SPECIESABCDE110000211111311111411110511100611000 The table shows the distribution of traits (A-E) in six extant species (1-6). A "0" indicates the ancestral condition, while a "1" indicates the derived condition. Based on this data, which pair of species diverged most recently?
A. 6 and 5 B. 1 and 4 C. 2 and 3 D. 6 and 4 E. 2 and 4