Asked by Chanelle Nichuals on Jun 07, 2024
Verified
Sponges are believed to have arisen from the choanoflagellates because they possess:
A) amebocytes
B) collar cells
C) spongin
D) spicules
E) oscula
Choanoflagellates
A group of free-living unicellular and colonial flagellate eukaryotes considered to be the closest living relatives of the animals.
Collar Cells
Also known as choanocytes, are flagellated cells that line the interior of asconoid sponges and are used for feeding by generating water flow and filtering food particles.
Amebocytes
Cells found in the bloodstream of invertebrates that move like amoebas, involved in various functions including distributing nutrients and forming immune responses.
- Clarify the relevance of collar cells to the physiology and ecology of sponges.
- Differentiate between the various phyla of marine invertebrates based on their anatomical and physiological traits.
Verified Answer
ZK
Zybrea KnightJun 08, 2024
Final Answer :
B
Explanation :
Sponges are believed to have arisen from choanoflagellates because both possess collar cells (choanocytes in sponges), which are similar in structure and function, suggesting a common ancestry. These cells are used for feeding and are characteristic of both groups.
Learning Objectives
- Clarify the relevance of collar cells to the physiology and ecology of sponges.
- Differentiate between the various phyla of marine invertebrates based on their anatomical and physiological traits.