Around 4.1 billion years ago the first single celled organism appeared
Sand should be your answer because it contains 5,0 premeability variation
<h3><u>Answer;</u></h3>
A skinner chamber
A <u>skinner chamber</u> is a chamber that isolates the subject from the external environment.
<h3><u>Explanation;</u></h3>
- A skinner chamber or skinner box an enclosed chamber which contains a bar or key that an animal can press or manipulate in order to obtain food or water as a type of reinforcement.
- <em><u>This box was used by Skinner in his experiments concerning Operant conditioning. From the experiments that he conducted he realized that the important part of any operant conditioning id recognizing the operant behavior and the outcome resulted in that particular environment.</u></em>
