What are the borders between tectonic plates called?

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

Migration is a. the movement of organisms from a native location to a foreign location b. the movement of organisms from a foreign location to a native location the movement of organisms from their water supply to their food supply d. the seasonal movement of organisms between locations c. select the best answer from above

Explain why it’s important for scientists to study the sun. list at least two challenges researchers face when examining earth’s nearest star.