Which heart sound occurs at the end of the ejection phase and at the start of ventricular relaxation?

List charasteristics of athenosphere

Astudent is looking through a microscope at some cells of an onion root tip. many of these cells are undergoing division since the root tip grows quickly and requires more cells. which cell most recently underwent metaphase? w x y z

Are the earth's ocean floor and continents the same age geologically? why or why not?