Answer:
4 Charles Darwin was not able to explain the variation
<span>The main reason why Anti Depressant drugs are taking the place
of a lot of Anti Anxiety drugs in the treatment of anxiety disorders is that
Anti anxiety drugs may be addictive and they usually have more side effects
compared with Anti Depressants.</span>
As water is cooled from 4 to 0, its density "decreases." Density is the amount of substance per a specific volume. So, if the water cools it's density decreases, but as the temperature rises it's density will increase because liquid to a gas and a gas has a high density then a liquid.
Hope this helps.