I think i started taking it in 4th-5th grade
Answer:
ice melting
juice freezing
paper folding
Explanation:
The difference between a physical reaction and a chemical reaction is composition. In a chemical reaction, there is a change in the composition of the substances in question; in a physical change there is a difference in the appearance, smell, or simple display of a sample of matter without a change in composition.
Answer:
Famine.
Explanation:
Famine, a shortage of water or food, will often result in a significant population decrease.
