The advantage of the exoskeleton system is that the support and protection functions are closely combined. ()

The inner layer of the exoskeleton (外骨骼) of an arthropod is called the ________. It contains chitin (几丁质), and its outer region is hardened. The outermost layer of the exoskeleton is waxy and impermeable to water. A: epicuticle (上表皮) B: procuticle (原表皮) C: hypodermis (真皮) D: basement membrane (基膜)

外骨骼(exoskeleton)一词来源于生物学, 是指为生物提供保护和支持的坚硬的外部结构