Answer:
Option A,
Explanation:
As per the conventional study belief’s, there were six main emotions – disgusted, happy, sad, angry, fear and afraid.
But with the later studies conducted at Glasglow, it became important that there are primarily four major emotions i.e Happy, Sad, Angry and afraid as it was concluded that anger and disgusted & fear and surprise have similar characteristics and they must be removed.
Hence, option A
Enzymes are biological catalysts – they speed up chemical reactions. Enzymes are required for most of the chemical reactions that occur in organisms . These reactions occur in the breakdown of chemical molecules, which we see in the digestive system . ... Enzymes are proteins that have a complex 3D-shape.
Answer:
euphoria
Explanation:
When a person takes alcohol, he/she feels relaxed and euphoric. This happens because of the release of endorphins. Endorphins are a chemical that produces the feeling of pleasure and happiness. After the first drink, the content of alcohol in blood is 0.05-0.06% which is sufficient to develop euphoric feeling.
However, some of the consumers have also claimed that it act as a depressant.
The answer is; the melanin in darkly pigmented skin protects DNA from UV radiation, and UV radiation can cause skin cancer
In Africa, due to its equatorial latitude location, receives direct sunlight at more or less 90 degrees most of the year. These highly concentrated rays increase the UV radiation exposure that can cause damage to cell DNA. Selection pressure, therefore, favored individuals with high melanin concentrations that protect against UV. Therefore population evolved towards high melanin densities in the skin.
Answer:
electromagnetic waves can travel in a vacuum
Explanation: