Because the melting/freezing point is the point at which the particles in a substance begin to go through the phase change
so for example at 0 degree's Celsius water starts to freeze, but at the same time also melts, its sorta like some of the particles are freezing while the others are melting at the same time, but if you go above 0 degrees then it melts, and if you go below it freezes
Answer;
-Carbohydrates
Explanation;
-Carbohydrates are the first nutrients broken down. It starts in the mouth with saliva and ends in the rectum.The main function of carbohydrates is to provide your body with energy to support muscular work, brain activity, breathing and other important activities. Carbohydrates are made up of sugars known as saccharides.
-Carbohydrate digestion begins in the mouth and is complete when the polysaccharides are broken down into single sugars, or monosaccharides, which can be absorbed by the body.
Two slightly different images
Answer:
hygrometer measures humidity
barometer measures air pressure
wind sock measures wind speed and Direction
anemometer measures wind speed