Changes that reorder atoms to form new molecules, such as the reaction between sodium and chlorine ions to form sodium chloride, are known as question 2 options: physical changes. boiling point changes. chemical changes. irreversible changes.

The correct answer is: chemical changes.

Chemical changes occur when two molecules (substances) combine together in order to make a new molecule. During the chemical change the atoms are rearranged. The production of a new substances is followed  by an energy change.

the correct answer is - ability to find a mate

the answer is d.) homologous; have mammary glands