All the stars, planets and galaxies that can be seen today make up just 4 percent of the universe. The other 96 percent is made of stuff astronomers can't see, detect or even comprehend. These mysterious substances are called dark energy and dark matter.
202) How often does your stomach manufacutre a new lining?
Extreme cold, while inhibiting the growth of most bacteria, does not usually kill them. And although heat and high and low pH will kill most known species of bacteria, certain species of Archaea can live in these extreme environments.
207) Which of the following forms the largest biomass on Earth?
Polytetrafluoroethene, also known as Teflon, is often used as a non-stick coating for pans and other cookware. It's resistance to van der Waals forces means that it is the only known surface to which a gecko cannot stick.
210) How long would you have to yell to produce enough sound energy to heat a cup of coffee?