Geologists can 'read' rock layers using relative and absolute dating techniques. ... Relative dating arranges geological events, and the rocks they leave behind, in a sequence. The method of reading the order is called stratigraphy (the rock layers are called strata).
The cortex which is composed of neurons and their supporting cells, and in living brain, has a gray color thus called the gray matter.
A niche describes where the organism lives and how it interacts with its environment .
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