C) two or more elements that have been chemically combined
The muscular and skeletal system because we use our brain to move our body it sends a signal to move that muscle that we want to use
it is not a prescription drug
Answer:
A
Explanation:
An element is a substance that cannot be broken down into simpler substances using ordinary chemical procedures. To disintegrate an element, procedures like nuclear reactions needed to be used.
In fact, it was thought of that the elements are indivisible during the days of Dalton, but advances in science and technology has shown that these elements could be broken down albeit not easily