Once blood delivers oxygen, what does it pick up from cells on its way back to the heart? nutrients

nitrogen

carbon dioxide

Mineral rich water heated by newly found oceanic crust escapes through cracks in the ocean floor called

Which of the following forest management practices is best for reestablishing areas of forest?

The earth's oceans are made up of chlorine, and trace elements. a) carbon, oxygen b) oxygen, silicon c) hydrogen, oxygen d) nitrogen, oxygen