What makes a fossil an index fossil ?

Explanation:

A fossil is an index fossil when it is distinctive, abundant, and limited in geological areas. A good index fossil lived for a short period of time so that the range of ages of the strata in which the index fossil is located is small. A good index fossil is found in a wide geological range.

A fossil is an index fossil when animals or plants preserved in the rock record of the Earth is characteristic by a particular span of geologic time or environment.

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so, when you eat, your teeth chew and grind food into smaller pieces. this is mechanical digestion. then reactions aided by digestive enzymes break down large food molecules into smaller molecules. this is chemical digestion. the two processes change the food into simpler substances that can be used by the body for raw materials and energy.

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tobey

lunar landing mission. apollo 11 was the first manned mission to land on the moon. the first steps by humans on another planetary body were taken by neil armstrong and buzz aldrin on july 20, 1969. the astronauts also returned to earth the first samples from another planetary body.

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