the study of animal life microform zoology zoologie inij 1 b h ni hcl mr 196 the study of animal life part m food canal where there is no hollow ball of cells but some other result of segmentation the formation of a gaslrula is not so obvious et in most cases some analogous infolding igt demonstrable in the hollow sar of cells there arc already two layers the outer which is called the ectoderm or epiblast forms in the adult the outer skin the nervou system and the incist important parts of the sense organs ihe inner which is called j the endodcrm or hypo renxnt.jpg from 求直接看的av无码网站⅕⅘☞tg@ehseo6☚⅕⅘•inij View Photo