Which cannot be separated into a simpler substance? compound, element, solution or mixture

The correct answer for above statement is:

Element:

Explanation:

Elements the simplest form of simple substance. They cannot be split into anything else by physical or chemical means. Composites pure substances that are the combinations of two or more elements. They can be broken into single substances by chemical means

they include patterns; cause and effect; scale, proportion, and quantity; systems and system models; energy and matter; structure and function; and stability and change.

can i get the brainiest answer

i answered it first

2b2t

explanation:

2b2t