It was a young tree when humans invented writing. Most diverse and geographically widespread of all plants, most imploy insects and other animals as courriers for transferring pollen to female sex organs, have vessel elements, which are short wide cells for transporting and supporting water. These elements form continuous tubules. There is a lot of range in the diversity in the animal kingdom. What an amazing mixture.
Earthworm is segmented both externally and internally.
They coordinate one set of circular muscles and another set of longitudinal muscles, which works against non-compressibly hydrostatic skeleton and can alter shape of each segment. Earthworms alternately elongate and contract. Their exoskeleton not only protects, but also provides points of attachment for appendage muscles. They are also segmented like annalids. MOst arthropods use either the shorter or rear appendages for moving in both sea and land.