Question

which description do porifera and cnidaria have in common?○ they use tentacles to immobilize their prey○ they live in freshwater and marine environments○ their cells are organized into structural and functional units○ they are asymmetricalquestion 12 (1 point)cnidarians body parts are arranged around a central axis, which is also known as ______ symmetry.○ asymmetrical○ lateral○ bilateral○ radialquestion 13 (2 points)match the following terms to the correct descriptiontentacle and mouth facing downward 1. polypoidtentacles and mouth facing upward 2. medusoid

Explanation:

For the first question:

• Porifera (sponges) lack tentacles, so the first option is incorrect.
• Porifera are mostly marine, some freshwater; Cnidaria live in both, so this is a shared trait.
• Porifera have no true tissues/functional units, while Cnidaria have tissues, so the third option is wrong.
• Cnidaria have radial symmetry, not asymmetry, so the fourth option is incorrect.

For Question 12:
Cnidarians have body parts arranged around a central axis, which defines radial symmetry. Asymmetrical has no axis, lateral is not a standard body symmetry term, bilateral has a single plane dividing into mirror halves, so radial is correct.

For Question 13:

• Polypoid (polyp) forms of cnidarians are sessile, with tentacles and mouth facing upward.
• Medusoid (medusa) forms are free-floating, with tentacles and mouth facing downward.

Answer:

1. They live in freshwater and marine environments
2. Radial
3. tentacle and mouth facing downward: 2. Medusoid

tentacles and mouth facing upward: 1. Polypoid