It’s a 10-item list, so you could use a 10-location memory journey (a.k.a., the method of loci) or a 10-item peg list.
Here’s your list with numbers:
- The body structure shows bilateral symmetry.
- They are triploblastic.
- They can be found in all types of habitats – land, water and soil.
- They have jointed limbs.
- The body is segmented into three regions – Head, Thorax and Abdomen.
- The body cavity is filled with blood and is called the haemocoel. The blood is white in colour.
- The exoskeleton is hardened and is made of chitin.
- They have a well-developed central nervous system.
- The head is well developed and bears the sensory organs and brain.
- They have compound eyes and mosaic vision.
I would extract a few keywords from each line and create mnemonic images for them. I’ve added some example images.
- bilateral symmetry – example image: I would picture a leaf that was used as an example in college.
- triploblastic – use an image borrowed from an illustration
- all habitats – picture the habitats at that location
- jointed limbs – picture limbs with wooden joints or something to emphasize the joints
- head, thorax, abdomen – picture a cartoon illustration of an arthropod that only contains those three parts
- haemocoel - white blood – picture a haemocoel filled with white blood at that location
- chitin exoskeleton – picture an empty exoskeleton at that location
- well-developed central nervous system – you could borrow an image of the actual nervous system
- well developed head: sensory organs and brain – picture some sensory organs and brain
- compound eyes, mosaic vision – picture eyes made of a mosaic
Then place the images for each line at locations in a memory journey. You could use an image of an arthropod as the memory journey. Here’s an example using a lobster:
(The legs are similar in that image, so you might want to move a couple of locations to the tail, or chain the images together with the story method – I memorized it by chaining the images using a story along the locations in the image above.)
If you haven’t used the method of loci yet, see the How to Build a Memory Palace page for an introduction.