I need help.

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

Prior to the mt. st. helens eruption on may 18, 1980, satellite and topographic views of the volcano were captured. based on the topographic map of mt. st. helens, what is the contour interval if the volcano height is 2,950 m? question 9 options: 600 m 400 m 750 m 500 m

Were you able to observe the nucleolus in any of the cells if so which ones