Identify the features which correspond to phylum Platyhelminthes.

Options

A. Diploblastic and Acoelomate
B. Triploblastic and Coelomate
C. Diploblastic and Pseudocoelomate
D. Triploblastic and Acoelomate

Answer

### Step-by-Step Solution:

1. **Definition of Phylum Platyhelminthes**:
- Platyhelminthes, commonly known as flatworms, are a group of invertebrates that are primarily characterized by their flat, soft bodies.

2. **Germ Layers**:
- Platyhelminthes are classified as diploblastic organisms, meaning they have two primary germ layers: ectoderm and endoderm. The mesoderm is absent in these organisms.

3. **Body Cavity**:
- One of the key features of Platyhelminthes is the absence of a true body cavity (coelom). This characteristic classifies them as acoelomates. Instead of a coelom, their bodies are filled with a solid mass of tissue.

4. **Habitat and Lifestyle**:
- Many Platyhelminthes are endoparasites, meaning they live inside the bodies of their hosts. A well-known example is tapeworms, which are part of this phylum.

5. **Summary of Features**:
- To summarize, the main features of Platyhelminthes include:
- They are diploblastic (two germ layers: ectoderm and endoderm).
- They lack a true body cavity (acoelomate).
- Many are parasitic, living within hosts.

### Final Answer:
The features that correspond to phylum Platyhelminthes are:
- Diploblastic organization (two germ layers: ectoderm and endoderm).
- Absence of a true body cavity (acoelomate).
- Many species are endoparasitic (e.g., tapeworms).

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