A scientist finds a fossil of a fish. What could be used to help the scientist infer the age of the fossil?
A. weather data from the area the fossil was found
B. index fossils found in the same rocks as the fish fossil
C. the life span of the same fish that live today
D. types of trees growing where the fossil was found

chert is a sedimentary rock composed of microcrystalline or cryptocrystalline silica. with this little bit of information, you can come to the conclusion that your answer is c.  

explanation:

50% lit on the left side

in the year 2850, humans successfully colonized mars. the martian modules that were constructed could hold only a small population of people. it is now a century later, and the population on mars has grown to 600 people. of the current mars population, 45 people express the recessive phenotype for phenylketon- uria (pku) syndrome (pp genotype).

explanation: