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Earthworm 提供精准即时的反馈机制，辅助学习者即刻纠正学习中的偏差，并通过高效的进度跟踪功能，让每位学习者都能实时掌握自身的学习进展，清晰认识到自己的学习里程碑
An earthworm is a soil-dwelling terrestrial invertebrate that belongs to the phylum Annelida. The term is the common name for the largest members of the class (or subclass , depending on the author) Oligochaeta .
The reddish-gray-colored common earthworm, often called a night crawler in the United States, is familiar to anyone with a fishing rod or a garden. They are indigenous to Europe, but are now ...
The earthworm is one of the most important creatures on earth and one that engineers the very foundations of the ecology we live in. They’re slimy, wriggly, subterranean critters, but they do more for us than we realise!
Earth Worm Characteristics. Earthworms are made up of many small segments known as ‘annuli’. These annuli are ridged and covered in minute hairs that grip the soil allowing the worm to move as it contracts its muscles. At about a third of the worms length is a smooth band known as the clitellum.
Earthworms are vital to soil health and to plants growing in it because they transport nutrients and minerals from below to the surface via their waste. An earthworm can eat up to a third of its...
May 21, 2024 · Earthworm, any one of more than 1,800 species of terrestrial worms of the class Oligochaeta (phylum Annelida)—in particular, members of the genus Lumbricus. Seventeen native species and 13 introduced species (from Europe) occur in the eastern United States, L. terrestris being the most common.
Earthworms are harmless, often beneficial residents of the soil. Earthworms breakdown dead and decaying organic matter into rich humus soil, thereby supporting plant growth. They also dig tiny channels and make holes that aerate soil and improve drainage.
An earthworm is an invertebrate animal with a long, stretchy body and no legs. It is a type of annelid . There are 5,500 known species of earthworms in 21 families .
There are thought to be 4,400 species of earthworm! As the earthworm spends most of its life underground, ploughing through the soil and creating complex burrow networks (that may extend 2m or more beneath the surface), their bodies are basically like a tube of muscle arranged in two layers.
