行业： 生物学
Appendages which are flexible, because they have no rigid skeleton. Cnidarians and molluscs are two kinds of orgnaisms which may have tentacles.
The last segment of the abdomen in many arthropods. May be flat and paddlelike, buttonlike, or long and spiny, as in the horseshoe crabs.
Central body cavity of sponges. More Info?
在昆虫和一些其他陆生节肢动物，将空气通过一个小开口进入了气管。昆虫有几个气门，沿着腹部两侧排列。
结晶或矿物的存款在海绵、 海参或 urochordates 中找到。他们中很多海绵的结构组件，可能会为一个防护作用服务的其他生物。
Support structure in animals, against which the force of muscles acts. Vertebrates have a skeleton of bone or cartilage; arthropods have one made of chitin; while many other invertebrates use a ...
打开或 urochordates，将水抽入体腔中软体动物。在许多软体动物，虹吸管可用于是强行驱逐水提供的推进力的一种手段。
0
词条
5
词汇
2
关注者
40
4
20 词条
