What is the probability of a homozygous a blood type mom and a heterozygous b blood type dad having an o blood type offspring?

What is thought to have caused the mass extinction at the end of the cretaceous period?

Asap. this question is 100 points if you answer it question: describe the basic relationship between ocean depth and temperature seen in the graph

Asquirrel population lives in an area. over many years, a river in that area grows wider and stronger, eventually forming a canyon. the squirrel populations on the two sides of the canyon can no longer mate with each other and ultimately form distinct species. this is an example of