Assertion: endocrine system's gland | /r/AtLocation | the most advanced phyla
Facets:
Source sentences:
text: Neurohemal organs appear first in the more advanced invertebrates (such as mollusks and annelid worms), and endocrine epithelial glands occur only in the most advanced phyla (primarily Arthropoda and Chordata).
text: Neurohemal organs appear first in the more advanced invertebrates (such as mollusks and annelid worms), and endocrine epithelial glands occur only in the most advanced phyla (primarily Arthropoda and Chordata).