Answer:sensory adaptation
Explanation:
Sensory adaptation occurs when our senses no longer percieves a stimulus because of our sensory receptor's continuous contact with it.

<em><u>One of the best ways to determine if a tree or any plant is dead is the tree scratch test. Just beneath the dry, outer layer of bark in a tree's trunk lies the cambium layer of bark. In a living tree, this is green; in a dead tree, it is brown and dry</u></em>
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It is the final electron acceptor the goes on to bond with 2 molecule to make water.
I believe the answer is 1960's