Scale color and fin shape
i have no clue!
He characterized them by their stems.
classifiction
You would use a classifiation key.
star fishes live in alone and in groups
a school, or a shoal
One method to divide organisms into groups based on specific characteristics is through a process called classification. Organisms can be grouped based on similarities in physical characteristics, behavior, genetic makeup, or evolutionary history. Scientists use techniques such as morphological analysis, genetic sequencing, and phylogenetic comparisons to classify organisms into different groups or taxonomic categories.
They travel in groups so that they can avoid predators if one happens to spot them from a far.
phyla?
Class Agnatha
Groups of fish is called a shoal.
by there behavior and the way they look