Bilateria

Illustration of the different types of symmetry in lifeforms (Field Museum, Chicago). Bilateral forms can have heads. Lifeforms with other types of symmetry have corresponding organs, if not a head.

The bilateria /ˌbaɪləˈtɪəriə/ or bilaterians are animals with bilateral symmetry, i.e., they have a front ("anterior") and a back ("posterior") as well as an upside ("dorsal") and downside ("ventral"); therefore they also have a left side and a right side. In contrast, radially symmetrical animals like jellyfish have a topside and a downside, but no identifiable front or back.

单词	Bilateral animal
释义	Bilateral animal 原声例句科学洞察双语版 Despite the fact our common ancestor lived nearly 700 million years ago, the genes that determine where nerves and guts end up are amazingly similar among all bilateral animals. 尽管我们的共同祖先生活在近7亿年前，但决定神经和肠子终结处的基因在所有的双边动物中都惊人地相似。英语百科 Bilateria The bilateria /ˌbaɪləˈtɪəriə/ or bilaterians are animals with bilateral symmetry, i.e., they have a front ("anterior") and a back ("posterior") as well as an upside ("dorsal") and downside ("ventral"); therefore they also have a left side and a right side. In contrast, radially symmetrical animals like jellyfish have a topside and a downside, but no identifiable front or back.
随便看	reinforcing the skin的意思 reinforcing the stomach的意思 reinforcing thread的意思 reinforcing thread, binding thread, decorative thread的意思 reinforcing thread, decorative thread的意思 reinforcing top soil的意思 reinforcing truss的意思 reinforcing white pigment的意思 reinforcing whiting的意思 reinforcing wire的意思 reinforcing work的意思 reinforcing yang的意思 reinforcing yang to relieve superficies syndrome的意思 reinforcing yin的意思 reinforcing yin essence的意思 reinform的意思 reinform的意思 reinform的意思 reinform的意思 reinfranchise的意思 reinfund的意思 reinfunded的意思 reinfunding的意思 reinfunds的意思 reinfusate的意思

Bilateral animal

Bilateria