n.棘皮动物

Echinoderms are a diverse group of marine animals, characterized by their spiny skin and radial symmetry.
海胆是一类形态多样的海洋生物，以其有刺的皮肤和辐射对称的体形而闻名。
The echinoderm larva undergoes a remarkable transformation called metamerism during its development.
海胆幼虫在其发育过程中会经历一个显著的变态过程，即分节（metamerism）。
The starfish, a type of echinoderm, feeds on a variety of sea creatures, including small fish and crustaceans.
星形海胆，一种海胆，以各种海洋生物为食，包括小鱼和甲壳类动物。
Echinoderms have a unique water vascular system that helps them move and capture prey.
海胆拥有独特的水管系统，这有助于它们移动和捕获猎物。
Some echinoderms, like sea urchins, play a crucial role in maintaining seafloor ecosystems by grazing on algae.
例如海胆，它们通过摄食海藻，在维护海底生态系统中起着关键作用。
The five-rayed sea star, or pentacerus echinoderm, is a common example of an echinoderm with a distinct five-pointed pattern.
五角星海胆（pentacerus echinoderm）是具有明显五角图案的常见海胆例子。
Echinoderms reproduce both sexually and asexually, allowing them to adapt to various environmental conditions.
海胆既能进行有性繁殖也能无性繁殖，使它们能适应不同的环境条件。
Paleontologists study fossil echinoderms to understand the evolution of marine life over millions of years.
古生物学家通过研究化石海胆来了解数百万年来海洋生物的进化历程。
Many echinoderms possess a hard external skeleton made of calcite, which protects them from predators.
许多海胆拥有由方解石构成的坚硬外骨骼，保护它们免受捕食者侵害。
Echinoderms exhibit a wide range of colors, from bright red to deep purple, which can serve as warning signals or for camouflage.
海胆展示出各种颜色，从鲜红色到深紫色，这些颜色可能用作警告信号或用于伪装。