Models are often used to represent very small objects or very large objects. why is it also useful to create life-size models of some objects?

Why are fossils not found in igneous rocks? igneous rocks are made from cooling of lava or magma. igneous rocks are found too deep underground. igneous rocks are too dark in color to contain fossils. igneous rocks are too dense to contain fossils.

Mineral rich water heated by newly found oceanic crust escapes through cracks in the ocean floor called

Some substances but not other can cross the (blank) membrane of a cell