Questions: Select all that apply What are characteristics of flukes? They lack a digestive system. They take in food through their mouths. Their life cycle usually involves two or more hosts. Their life cycle almost always involves a snail host.

The characteristics of flukes are:

1. They take in food through their mouths.
2. Their life cycle usually involves two or more hosts.
3. Their life cycle almost always involves a snail host.

Explanation:

1. They lack a digestive system.

   • This statement is incorrect. Flukes (trematodes) do have a digestive system, although it is relatively simple. They have a mouth, pharynx, and a branched gut.

2. They take in food through their mouths.

   • This statement is correct. Flukes ingest food through their mouths, which leads to their digestive system.

3. Their life cycle usually involves two or more hosts.

   • This statement is correct. Flukes typically have complex life cycles that involve multiple hosts, often including an intermediate host (usually a snail) and a definitive host (where the adult fluke resides).

4. Their life cycle almost always involves a snail host.

   • This statement is correct. The life cycle of most flukes involves a snail as an intermediate host, which is crucial for their development and transmission.

In summary, the correct characteristics of flukes are that they take in food through their mouths, their life cycle usually involves two or more hosts, and their life cycle almost always involves a snail host.