What animal group lacks true tissues and includes species that are asymmetrical?Multiple choice question.flatwormscnidariansmolluskssponges

Break Down the Problem

1. Identify the animal groups mentioned in the options.
2. Assess which group lacks true tissues and is asymmetrical.

Relevant Concepts

• True tissues: A group of cells that work together to perform a specific function. Animals can be categorized based on the presence or absence of true tissues.
• Symmetry: Refers to the arrangement of body parts, with asymmetrical animals lacking any symmetry.

Analysis and Detail

• Flatworms: They belong to the phylum Platyhelminthes and possess true tissues, allowing them to have a degree of organization.
• Cnidarians: This group includes jellyfish and corals and has true tissues but displays radial symmetry.
• Mollusks: Members of this group, such as snails and squids, have true tissues and exhibit bilateral symmetry.
• Sponges: They are simple multicellular organisms from the phylum Porifera and lack true tissues. Sponges are also asymmetrical, having no defined shape.

Verify and Summarize

From the analysis, sponges are the only group listed that lack true tissues and include species that are asymmetrical.

Final Answer

The correct answer is sponges.