Zero degrees latitude is the line designating the Equator and divides the Earth into two equal hemispheres (north and south).
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https://www.wiley.com/college/boyer/0470003790/structure/tRNA/trna_text.htm
Fossils only form if certain qualifications are met, and some organisms cannot meet them, so they just cease to exist, not a single sign of them. This could happen if they were organisms that decayed completely. Fossilization can include freezing, drying, and encasement, usually in tar or resin.
Xylem is a very useful tissue in plants used for transportation of water from roots of a plant to its upper part for its proper growth
