Question

what do these two changes have in common?
a dinosaur bone turning into rock over millions of years
bleaching clothes
select all that apply.
both are caused by cooling.
both are chemical changes.
both are caused by heating.
both are changes of state.

Explanation:

A dinosaur bone turning into rock (fossilization) involves chemical replacement of organic material with minerals, forming a new substance. Bleaching clothes uses chemicals (e.g., hydrogen peroxide) to break down dye molecules, altering their chemical structure. Both are irreversible changes creating new substances, so they are chemical changes. Cooling, heating, and state changes do not apply to both.

Answer:

Both are chemical changes.