Answer:
Certain fossils, called index fossils, help geologists match rock layers. To be useful as an index fossil, a fossil must be widely distributed and represent a type of organism that existed for a brief time period. Index fossils are useful because they tell the relative ages of the rock layers in which they occur.
Answer:
to see if you have certain infectious diseases you can pass on
Explanation:
Transparent means all light can shine through. Common substances that are transparent are clear glass, clean water, and cellophane. Translucent means only some light can filter through the substance. Common translucent substances are tissue paper, the skin of your hand, and lamp shades. Opaque means little to no light passes through the substance. Common opaque substances are denim, cardboard, and leather.
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The kidney filters about 200 quarts of blood to remove about 2 quarts of waste and excess water. That excess water and waste is sent to the bladder and leaves the body as urine.