assume that p-waves travel at a speed of 8 km/s. approximately what time did the earthquake occur?show all work.

How can scientists test their ideas about the origin of the universe if they can't physically interact with or study?

Which situation is an example of not doing work? lifting a couch throwing a baseball running up stairs carrying a box

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.