Compare and contrast the continental shelf and the abyssal plain.

The continental shelf is a shallow, near horizontal seafloor extension from the shoreline to the upper continental slope. This shelf forms the shallow margin of each deep-ocean basin. ... At the base of this steep slope is the continental rise which finally merges into the deep ocean floor, the abyssal plain.

phylogenetic tree is the tree of life or evolution tree. it shows the different branches of evolution. the sequence goes like tissues - coelom - backbone - endoskeleton - segmentation

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