A scientist studies corresponding genes in two species. Which data would be most useful for determining the time when the split from the common ancestor occurred?
A. mutation rate and the number of mutations in each sequence
B. mutation rate and the number of nucleotides in each sequence
C. mutation rate and the number of nucleotides that differ between the two sequences
D. the number of repeated nucleotides and their specific locations in the two sequences

Liquid water turns into water vapor at which step in the water cycle? a. precipitation o b. water run off c. evaporation d. condensation

Recent research by marine biologists suggests that bottlenose dolphins have names for themselves. scientists played sounds they had identified as the names of particular dolphins, putting them through a synthesizer so that they did not sound like the voices of particular dolphins. the researchers found that dolphins would respond to the names of other dolphins that they were related to or associated with, but they ignored the names of strangers. this discovery suggests a much greater degree of self-awareness in aquatic mammals than was previously suspected. if this research holds up, what does it suggest about dolphins?

Why do we perceive objects as retaining their brightness under different lighting levels?