How can scientists determine a timeline for the divergence of species? Describe how that process works.

In which situations is the principle of cross-cutting relationship useful in determining relative age?

If two parents who's blood types are both b produce a child that has blood type o, what can you say about the parent's genotybes? oa) one is ii ob) one is ibi oc) both are bi od) nothing, this is impossible

Awave has a wavelength of 15 mm and a frequency of 6 hertz. what is its speed?