select the correct answer.\nwhich phylum includes animals that lack tissues?\na. cnidaria\nb. porifera\nc…

select the correct answer.\nwhich phylum includes animals that lack tissues?\na. cnidaria\nb. porifera\nc. platyhelminthes\nd. arthropoda\ne. chordata

select the correct answer.\nwhich phylum includes animals that lack tissues?\na. cnidaria\nb. porifera\nc. platyhelminthes\nd. arthropoda\ne. chordata

Answer

Brief Explanations:

To determine the correct phylum, we analyze each option:

  • Option A (Cnidaria): Cnidarians have true tissues (diploblastic), so they are not the answer.
  • Option B (Porifera): Sponges (Porifera) are the only animals that lack true tissues; they have cellular - level organization.
  • Option C (Platyhelminthes): Flatworms have tissues and are triploblastic, so this is incorrect.
  • Option D (Arthropoda): Arthropods have well - developed tissues and organ systems, so this is wrong.
  • Option E (Chordata): Chordates have complex tissues and organ systems, so this is incorrect.

Answer:

B. Porifera