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Lessons 1 & 2

Across
Each of the more than one hundred substances that cannot be chemically broken down into simpler substances.
Able to be easily physically, emotionally, or mentally hurt, influenced, or attacked.
A thing that is composed of two or more separate elements; a mixture.
A molecule that carries the genetic instruction used in the growth, development, functioning, and reproduction of all known living organisms and many viruses.
Serious injury to the body, as from physical violence or an accident. Severe emotional or mental distress caused by an experience.
A special skill or knowledge in a particular field.
Down
A unit of heredity that is transferred from a parent to offspring and is held to determine some characteristic of the offspring.
An electrically neutral group of two or more atoms held together by chemical bonds. Unlike ions, they lack an electrical charge.
A tabular arrangement of the chemical elements, ordered by their number of protons, electron configurations, and recurring chemical properties. It is useful for analyzing chemical behavior and is widely used in chemistry and other sciences.
A solid inorganic substance of natural occurrence.
A substance or activity that causes someone to become hooked on it; causing dependancy.
A specialized cell that transmits nerve impulses. A nerve cell.