Answer: Fossils and relative dating
Explanation: Land and rock experts have studied the order in which (things in rocks that lived a long time ago/old, outdated things) appeared and disappeared through time and rocks. This study is called biostratigraphy.
More on space than on earth
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Receptor potential is generally at the receiving region. The receptor potential(also called generator potential) can work to trigger an action potential either within the same neuron or adjacent cell.Within the same neuron the receptor potential causes local current flow to the region responsible for action potential.