Sponges are believed to have arisen from the choanoflagellates because they possess:a. amebocytes. ...

Sponges are believed to have arisen from the choanoflagellates because they possess:a.
   amebocytes.
  b. collar cells.
  c. spongin.
  d. spicules.
  e. oscula.

Question 2

Draw a cladogram that for the following animals: sponges, cnidarians, flatworms, echinoderms, chordates, molluscs,
  annelids, nematodes, and arthropods. On your cladogram indicate the points where the following evolved: 1) true tissues,
  2) bilateral symmetry, 3) three germ layers, 4) segmentation, 5) protostome development, and 6) deuterostome
  development. What will be an ideal response?