What Causes the Common Cold?
What Causes the Common Cold? Common colds are caused by tiny organisms called viruses, which infect the mucous membranes of the nose and thr
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What Causes Black and Blue Marks?
What Causes Black and Blue Marks? If you fall or receive a sharp blow, you may get a painful bump that soon turns black and blue. When you b
How Do Clams Eat?
How Do Clams Eat? Most clams burrow in sandy or muddy bottoms in shallow water. The clam gets its food from the water in an unusual way. At
Why Do Fish Have Scales?
Most fish are covered with a layer of flat scales, which overlap each other like the shingles on a roof. The hard scales form a protective c
How Do Snails Move?
A snail moves around by creeping on a part of its body that seems to be its stomach. The fact is that the whole bottom part of a snail’s bod