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.
<span>If the osmotic pressure in the glomerular capillaries increased from 28 mm hg to 35 mm hg, net filtration would decrease.</span>
False. Agribusiness is agriculture conducted on a large, commercial scale.
