Question

list two differences and one similarity between plantyhelminthes and nematodes​

Answer 1

Differences

Platyhelminthes :

1. Blind sac plan.
2. Body cavity absent ( Acoelomata).
3. Ex - Liver Fluke , Blood Fluke , Planaria , Tape worm , etc.

Nematoda :

1. Tube with in a tube plan.
2. Body cavity present (Pseudocoelomata).
3. Ex - Roundworm , Pin worm , Ascaris , Wuchereria , etc.

Similarities

1. Organ level organization.
2. Organ level organization.Triploblastic.
3. Bilateral symmetry.

Answer 2

Platyhelminthes have an incomplete gut whereas nematodes have a complete one. Unlike in nematodes, Platyhelminthes have flame cells to do the excretory functions. The body length of flatworms may vary from 1 mm or less to many meters. Unlike flatworms, most roundworms are microscopic.

Some of the few similarities between the two groups:

Both are true animals and have all the features that come with that (Eumetazoa)

Both have bilateral symmetry–are roughly the same left to right–and are a member of clade Bilateria

Both are extremely enthusiastic as parasites

Neither have any hard parts and have little fossil record

Both are roughly worm shaped, although the occasional platyhelminth gets creative with this

Both are triploblastic–they have three cell layers during development, unlike cnidarians like anemones, which are diploblastic.