yes i m agree with that Pure substances include only single atoms made of one element.
in chemistry , a pure substance that has only one kind of atom and cannot be broken into two or more simpler substance by physical or chemical means is an element . for ex. gold , silver , iron etc
Answer:
between c. 95,000 and c. 20,000 years
Explanation:
An enzyme is a substance produced by a living organism that acts as a catalyst to bring about a specific biochemical reaction. nucleus.
