The answer is Echinoderms.
According to the Embryological studies, the most ancient chordates were closely related to the ancestors of the echinoderms. Echinoderms are members of the group Phylum Echinodermata of marine animals. Some known echinoderms are starfish, and sea cucumbers.
You mean histology right??
Histology:
Histology, also microanatomy, is the ponder of the life structures of cells and tissues of plants and creatures utilizing microscopy.
Water! (abiotic)
If water runs out then everything dies! :)
Thanks for the opportunity to answer your question and I hope this help! :)
The smallest thing they study is cells, i think!
hoped this helped!!
He went to the Galapagos Islands and studied different species of finches and plants that had adapted differently on the different islands.
