Buffers maintain a pretty stable pH level, resisting any large changes. When introduced to a base, it will act as an acid to counteract it, and vice versa.
Answer:3 molecules or mass.
Explanation:
ATP is the main energy-providing molecule in living organisms.
These fossils are very useful for us because we can use them to date the layers of rock that they are found in. Fossils that can be used in this way are called index fossils, and rock layers with the same index fossils in them can be correlated. Not my answer, link here for full
http://peter-mulroy.squarespace.com/correlating-rock-layers/
Only unicellular orgaimns I might be wrong
