animals withought backbones aka invertebrates.
they are classified into 5 smaller groups:
1. cnidarians - these live mostly in the sea and have tentacles...they paralyse their prey and eat it...as in just push it in their mouth.
2. worms - three major types of worms
- flatworms - which have flat bodies with a mouth on one end
- roundworms - which have long, thin bodies, and live underground mostly
- segmented worms - they have long tube shaped bodies that are made up of segments.
3. molluscs - these include animals like slugs, snails etc...their bodies are soft and have either one or two shells to protect them...9according to a book i looked up the other day, they also have a muscular 'foot')
4. echinoderms - these are the type of animals that live in the sea and have tough skins. eg . starfishes
5. arthropods - they are the largest group of invertebrates...bodies are divided into segments and the outer body is is supported by a hard skeleton called exoskeleton, if they grow too big for the exoskeleton, then they grow a new one...they also have feelers aka antennae...even anthropods have smaller groups...four smaller ones to be secific...i'm just going to name them
those with back bines aka vertebrates...im only going to name them since you should know about them already...as in like...what they are :)
- amphibians - the ones that can live under water and on land eg. frogs
- reptiles eg. snakes or crocodiles
- mammals eg. us :D
i hope that helped...im not an a-level student...but i wrote what i knew...i hope it helps.