decomposition of what was alive then the remains are buried by sediments which results in fossilization
Ribosomes synthesize proteins
Proximal convoluted tubules
Although they are radically symmetrical,echinoderms are more closely related to human than to a jellyfish because they are biltarian.
PMAT.
Prophase
Metaphase
Anaphase
Telophase
to creat daughter cells.