False, there are certain foods that are protein yet they are liquid. The following are fish, beans, nuts, and vegetables. There are protein that is liquid but not all of them are.
Of course increases. Because we know that CO2 is one of the reason for Green House effect and we know that this effect is responsible for heating up of earths surface. Hope it helps.
The land will develop into more houses leading to urbanization which will destroy the material resources it will decrease because the chemical will affect the water quality leading to a decrease of fish population. Hope this helps
It keeps fish warm in the winter.