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I think you are talking about a chemical change,
The ink of a marker used to be made of toluene and xylene. These substances were found to be quite harmful so now the ink is usually made out of alcohols such as 1-propanol, 1-butanol, diacetone alcohol and cresois.
For example, it could be shown that water is made of other substances by electrolysis, that separates it into oxygen and hydrogen.
Plant cells are enclosed by a cell membrane and cell wall. The cell wall is a rigid structure made up of cellulose and the cell membrane is a semipermeable membrane made up of protein and fat.
Anything!
Air Pollutant. (:
Not all are that harmless. Sickle cell disease is a point mutation. A missense mutation can be harmful, but substituting one purine base for another, or having the same type of amino acid, hydrophobic to hydrophobic for instance, made is not harmful.
Antigens are substances that incite your immune system to respond by producing antibodies. They include both foreign substances, such as pollen, and substances made by the body. Ones made by the body are non harmful.
By giving the hydrogen a handjob
Your skin is an epidermal tissue that is designed to repel harmful things out. Through the process of diffusion, water, air and alike substances can travel through the skin. Harmful chemicals or alike things are kept out and in cases where contact is made between harmful substances and your skin, your skin goes through a process of apoptosis and dies.
pacifiers are made of plastics but there are some chemical such as phthalates "DINP di isononyl phthalates". phthalates are generaly thought to be harmful. however the amount in pacifiers is said to be harmless
No, an item for consumer use normally won't contain harmful substances; if it did, there would be a label saying it did.
Lead is poisonous so eating lead would be harmful. However most pencils are now made from graphite, although people refer to it a lead still. Graphite from a pencil is harmless.
Organic insect pest control is safe for children because it is made from all natural ingredients. making it safer and less harmful for children.
In moderation, it's not too harmful. I'm sure if they made it illegal, it would start a crime wave (like there already are for illegal substances).
I think you are talking about a chemical change,
The ink of a marker used to be made of toluene and xylene. These substances were found to be quite harmful so now the ink is usually made out of alcohols such as 1-propanol, 1-butanol, diacetone alcohol and cresois.