The answer is <span>C. Change in odor.
There are several signs of chemical reaction:
1. Dissolved precipitate.
2. Formation of gas (bubbles).
3. Change of color.
4. Change of temperature (warming or cooling).
5. Production of energy.
Among these signs, there is no change in odor, which is, thus, the right choice.</span>
Endorphins are a type of neuropeptides short strings of amino acids that are narrowly targeted to perform a specific job. For instance, endorphins specialize in reducing pain.
<u>Explanation:</u>
Endorphins are opiod neuropeptides that are produced by the central nervous system. They are natural pain killers that are produced by our body to reduce pain.
They are of 3 types namely, alpha endorphins, beta endorphins and gamma endorphins. All of these specifically bind to the opioid receptors inhibiting the communication of pain signals.
Answer:
D. an educated guess or tentative explanation for a natural phenomenon.
Explanation:
A hypothesis is an idea or explanation that is tested through study and experimentation. Outside science, a theory or guess can also be called a hypothesis. In other words, hypothesis is defined as a proposed explanation for a phenomenon.
A trial solution to a problem as a hypothesis is often called an educated guess because it provides a suggested outcome based on the evidence.
