Scientists apply the concept of a molecular clock to estimate the time two species evolved separately.

Which data are most useful for the estimation?

A. common traits of the two species
B. homologies among the two species
C. DNA sequence differences between the two species
D. DNA fingerprinting of common fossils

The sketch shows a rynchosaur, an extinct animal that is known only from fossils. there has been much debate about the classification of these creatures. some scientists suggest that they belong with primitive amphibians, and some think they are related to snakes and lizards.the data equally support both cases. which statement best explains how to draw a cladogram that includes the rynchosaur? draw the cladogram for amphibians. draw the cladogram for reptiles. draw two cladograms, both showing the traits, and leave it as a hypothesis. draw two cladograms, both showing the traits, and have scientists vote

Which term describes a normal value for something in the body? a.homeostasis b.set point c.feedback loop d.integration center

What is true of sea slugs in these orders