Place each description in the correct category. represented by symbols
Elements
Compounds
made of one type of atom
represented by formulas
cannot be broken down
can be chemically broken down
made of two or more types of atoms

Ahypothesis is? close agreement by competent observers of observations of the same phenomena. a guess that has been tested over and over again and always found to be true. an educated guess that has yet to be proven by experiment. the long side of a right triangle. a synthesis of a large collection of information that includes guesses.

Determine the age of a fossil if it had only one eighth of its original carbon-14 content remaining?

If the chemical properties of a substance remain unchanged and appearance or shape of a substance changes it is called a ?