Vietnam or Thailand ? Vote for the TOP Country of the Week !
Updated: May 10, 2025
We still find, both in the sea and in fresh water, various kinds of primitive multicellular organisms that substantially resemble the blastula in structure, and may be regarded in a sense as permanent blastula-forms hollow vesicles or gelatinous balls, with a wall composed of a single layer of ciliated homogeneous cells.
Word Of The Day
Others Looking