A substance that tends to reduce the surface tension of a liquid in which it is dissolved (took that right from dictionary.com)
Heart,eyes,blood vessels and skeleton people.
Soil and air because it is needed for the development of living beings
Answer:
The law of superposition
Explanation:
The law of superposition is an axiom and a basic principle of sedimentary stratigraphy, it explains that the layers of sediment are deposited in a temporal sequence, in which the oldest are in a lower position than the most recent. Therefore, if there has been no deformation, the lower layers were deposited before the ones above, so they are older.
