Which of these changes MUST happen for elements to become a compound? A. elements are heated

B. a gas becomes a liquid

C. elements dissolve in water

D. chemical bonds form between atoms

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

Which of the following was a characteristic of a dromaeosaur? modified front claw grasping with their forelimbs both a and b none of the above

Ascientist is examinin the cell is disrupted when she damages one specific type of macromolecule g the function of macromolecules in a cell she notices that movenent of large molecules into and out of