Which gravitational force between the moon and the earth depend on?

Are substances released into the environment that in excess amounts cause damage

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

You are working in the lab and are working with the same element but with varying isotopes of the element. you are working with c-11, c-13, c-14, and c-15. what is the average atomic mass of this element? (use periodic table) a- 12 b-15 c-14 d-13