Which of the following statements describes sponges?

• A. Sponges are aquatic animals with a backbone and a closed circulatory system.
• B. Sponges are sessile animals that lack true tissues and organs.
• C. Sponges are terrestrial animals that reproduce through seeds.
• D. Sponges are mobile animals that have a complex nervous system.

Answer: (B)

Verified step by step guidance

1. Identify the key characteristics of sponges: Sponges are simple aquatic animals that belong to the phylum Porifera.
2. Understand that sponges are sessile, meaning they are fixed in one place and do not move.
3. Recognize that sponges lack true tissues and organs, which distinguishes them from more complex animals.
4. Note that sponges do not have a backbone (they are invertebrates) and do not possess a closed circulatory system.
5. Conclude that the correct statement is: 'Sponges are sessile animals that lack true tissues and organs.'