Which of the following defense mechanisms are found in invertebrates?

Which of the following defense mechanisms are found in invertebrates?
 
  a. phagocytes
  b. lysozyme
  c. antibodies
  d. phagocytes and lysozyme
  e. phagocytes, lysozyme, and antibodies

Question 2

How do the antibodies of sharks differ from those of mammals?
 
  a. Shark antibodies do not have light chains.
  b. Shark antibodies do not have heavy chains.
  c. Shark antibodies have a different arrangement of embryonic gene segments.
  d. Shark antibodies are produced without rearrangement of gene segments.
  e. Shark antibodies have light, heavy, and moderate chains.