The steps of the formation of fossil fuels are:
<span>Plants and trees inhabited the land and the seas about 300 million years ago.
</span><span>Organisms died and were buried on the ocean floor and in swampy areas.
</span><span>Layers of silt and sand covered their bodies.
</span><span>The organic matter in their bodies was subjected to great heat and pressure deep inside the crust.
</span><span>The enormous heat and pressure formed coal over millions of years. </span>
Because in wet climates the limestones break due to the rain, and dry climates do nothing to the limestone.
At least 75% of the history of the earth
Facilitated diffusion. It is a passive transport mechanism in which carrier proteins shuttle molecules across the cell membrane without using the cell’s energy supplies. Instead, the energy is provide by the concentration gradient, which means that molecules are transported from higher to lower concentrations, into or out of the cell. The carrier proteins bind to glucose, which causes them to change shape and translocate the glucose from one side of the membrane to the other. Red blood cells use facilitated diffusion to absorb glucose.
