Cohesion- is when a substance unites together and forms a whole.

A pH- is a scale based on concentration of hydrogen ions in a solution.

Polarity - It's Positive and Negative. The flow of a current is from (+) to (-).

If water goes down a stream. You can't reverse it.

Heat storage - is the amount of energy needed to raise the temperature of an object by one degree Kelvin.

• Macromolecules have many atoms in them.
• All macromolecules that are organic have carbon in them and their are four types of them.
• They are lipids, nucleic acids,carbohydrates and proteins.
  

• Proteins are made up by about twenty different amino acids.
  
• Proteins are in each and every cell in your body.
  
• Proteins are nutrients that supply the body with energy.
  
• A type of protein is called keratin and it makes up hair.
  
• Proteins change into different shapes and it determines how it interacts with things in the body.
  
• Some proteins help muscles function or us to stay alive.

• Carbs are made of oxygen, carbon and hydrogen.
• Carbs are a main source of energy in your every day life.
  
• Carbs provide energy for the body and helps breakdown fatty acids.
  
• Some food with carbs are bread, dried fruit, candy and fructose .
  

• Nucleic acids are long chains of smaller molecules called nucleotides.
• Nucleotides have three parts which are a sugar, a base and a phosphate group.
• There are three types of nucleic acids RNA, DNA and ATP
• RNA promotes chemical reactions like an enzyme
• DNA stores hereditary information
• ATP breaks down the food molecules inside of cells.