What is a presrved organism movment

trace fossils are typically formed when an organism moves over the surface of soft sediment and leaves an impression of its movement behind. Tracks are the markings of movement  If these impressions are covered with sediment before they get washed away, they become preserved as fossils. 

Ovum

Explanation:

In zoology, the Latin term for egg, ovum, is frequently used to refer to the single cell.

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