Decide which of the substances listed can form hydrogen bonds. (Select all that apply.) HF NH3 H2O H2 CH4 H2O2 Changed: Your submitted answer was incorrect. Your current answer has not been submitted.

1) describe the physical layout of the ocean floor ? 2) explain how the dumbo octopus swims differently than other octopus species and why this would be an advantage in the aphonic zone . 3) why are the types of organisms that live at each underwater hot vent so dramatically different ?

Air can be considered a mixture. which statement does not explain why?

The fact that the total amount of energy in a system remains constant is a(n)