Supondo que você precise comprovar a esfericidade do nosso planeta, marque a(s) característica(s) que deve(m) estar presente(s) em seu argumento

The answer is a) carbon-12

Heat is involved in chemical change in two ways; chemical changes either result in heat being added to or removed from an object, and chemical changes require a certain amount of heat before they can take place.

Answer trigonal pyramidal;