ryo preservation techniques involves by using*2 pointsLiquid sulphurLiquid NitrogenLiquid chlorineDry ice

It seems like you're asking about cryopreservation techniques and the substances involved. Here's a brief explanation:

1. Liquid Nitrogen: This is the most common substance used in cryopreservation. It is used to freeze and store cells, tissues, or any other biological constructs without damaging them. The temperature of liquid nitrogen is -196 degrees Celsius, which is cold enough to stop all biological activity and preserve the samples.

2. Dry Ice: Dry ice, or solid carbon dioxide, is also used in cryopreservation. It has a temperature of -78.5 degrees Celsius. It's not as cold as liquid nitrogen, so it's not used for long-term storage. However, it's often used for transporting biological samples because it's safer and easier to handle.

3. Liquid Sulphur and Liquid Chlorine: These are not typically used in cryopreservation. Liquid sulphur and liquid chlorine are both dangerous substances that can cause harm to biological samples. Therefore, they are not suitable for preservation purposes.