How can u classify all animalia kingdom categories? especially platyhelminthes!

There are several ways you can categorize things. This is an example of  how I would put animals in order

1. Porifera (sponges)...they consist of a simple cell arrangement
2. Coelenterata (e.g Jellyfish) have an actual tissue
3. Platyhelminthes they are more complex and have muscles
4. Insects. They have several organs that and a simple brain

Molecules called lipids have long hydrocarbon chains that determine the way they act. they can be fats, oils, or hormones, and even exist in our cell membranes