Two or more elements combined into one substance through a chemical reaction, such as water, form a chemical compound. All compounds are substances, but not all substances are compounds. ... Pure distilled water is a substance, but seawater, since it contains ions and complex molecules, is a mixture.
<span>C) the force of gravity</span>
The system that controls hormones is the endocrine
A....................................
Some have been noted to live as long as 6 days without there head.