Potential mates (or
members of the same sex
competing for mates)

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

What does the splanchnic nerve innervate?

Which statements explains what the fossil records indicates? check all that apply. a) earth is 4.5 billion years old b) many organisms have become extinct c) mammals have always existed on earth d) mass extinctions have occurred several times on earth e) the amount of water on earth has decreased over time?