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which of the following is an example of evidence supporting the theory that volcanic eruptions caused the dinosaurs to become extinct?
a. massive lava flows in india date to the same time period.
b. a thin layer of rock containing iridium formed at that same time period.
c. many sea creatures became extinct at the same time as the dinosaurs.
d. volcanoes often form along boundaries between the sections of earth's crust called plates.

Cladistics is a way of classifying organisms by examining the characteristics of their ancestors and descendants and depicting the relationships in a cladogram. which of the following best describes a challenge in classifying organisms this way? a. there are millions of species on earth, and a cladogram is not a practical means for classifying all of them. b. it is impossible to tell which organisms are most closely related to each other using a cladogram. c. cladograms are detail-oriented and do not provide a useful understanding of evolutionary relationships. d. there is a limited number of ways to organize the information, so most cladograms end up looking very similar.

Sedimentary rocks located under the ocean may contain what commercial products

Explain the purpose of a molecular clock and the properties that a section of protein must have to be used in this way.