Animals represented in Ediacaran fossils are morphologically very similar to modern-day lophotrochozoans. Ediacaran fossils depict animals with mineralized endoskeletons, similar to modern-day vertebrates. If you were to place the animals depicted in Ediacaran fossils in a phylogenetic tree, these organisms would share their most recent common ancestor with choanoflagellates. Ediacaran fossils depict

Traditionally, these fauna have come to represent an important development in the evolution of life on Earth, because they immediately predate the explosion of life-forms at the beginning of the Cambrian Period 541 million years ago.

Explanation:

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x would be the most and the least would be y because there are more fruit   and seeds than flock z has insects

"a.) well–developed vascular system."