Question

name station #4: evolutionary link date pd choanoflagellate (protist) sponge choanocyte cell (animal) sponge 1. compare the choanoflagellate protist to the sponge choanocyte cell: 2. explain the significance illustrated in the diagram above in terms of evolution. use the word - bank to help write your answer! word bank: choanoflagellate choanocyte protist animal unicellular multicellular common ancestor evolved

Explanation:

1. Both choanoflagellate protist and sponge choanocyte cell have similar shape and structure with a collar - like structure around a flagellum. The choanoflagellate is a unicellular protist while the choanocyte is a cell type in multicellular sponges.
2. The diagram illustrates the evolutionary link. Choanoflagellates are thought to be the closest unicellular protist relatives of animals. Sponges are the simplest multicellular animals. The similarity in choanoflagellates and sponge choanocytes suggests that animals evolved from a unicellular choanoflagellate - like ancestor.

Answer:

1. Similar in shape and structure with collar - like structure and flagellum; choanoflagellate is unicellular protist, choanocyte is in multicellular sponge.
2. Choanoflagellates are likely the unicellular protist ancestors of animals. Sponges, as simple multicellular animals, have choanocytes similar to choanoflagellates, indicating animals evolved from a choanoflagellate - like common ancestor.