Jill and Susan violated safety procedures by not properly listening and/or reading over the instructions to know all the materials, steps, and equipment they need for the lab. Hope this helps!
Answer:
a substance made by mixing other substances together.
Explanation:
A mixture is a substance made by mixing two or more substances together.
An organism that is able to form nutritional organic substances from simple inorganic substances such as carbon dioxide.
1 elements
2 they have same number of valence electrons
3 period