Question

what do these two changes have in common? firing a clay pot in a hot kiln snails growing shells select all that apply. both conserve mass. both are chemical changes. both are caused by heating. both are only physical changes.

Explanation:

Firing a clay pot in a hot kiln involves chemical reactions as the clay undergoes changes in its chemical composition. Snails growing shells also involve chemical processes as they secrete and form new materials for the shell. According to the law of conservation of mass, mass is conserved in all chemical reactions. Snails growing shells is not caused by heating. And both are not just physical changes as new chemical substances are formed in both cases.

Answer:

Both conserve mass., Both are chemical changes.