Question

what feature do both cnidarians and poriferans have?
both have radial symmetry.
both have tissues.
both have a nervous system,
both have cells.

Explanation:

• Poriferans (sponges) lack radial symmetry (they are asymmetrical or have irregular symmetry), while cnidarians have radial symmetry. So the first option is incorrect.
• Poriferans do not have true tissues (they have cellular level of organization), while cnidarians have tissue level of organization. So the second option is incorrect.
• Poriferans lack a nervous system, and cnidarians have a simple nervous system (nerve net). So the third option is incorrect.
• All living organisms, including poriferans and cnidarians, are made up of cells. So the fourth option is correct.

Answer:

D. Both have cells. (Note: Assuming the options are labeled A - D as per the order: A. Both have radial symmetry, B. Both have tissues, C. Both have a nervous system, D. Both have cells)