Both are invrtibrates,and have advanced internal transport systems and a true coelom. Scientists also believe they have a common ancestor because both phylla contain species which produce free-swimming Trochophore Larvae (most molluscs except Cephalopods, and Class Polychaeta in Annelids).
Crayfish are classified as arthropods, because of their characteristic segmented bodies, chitinous exoskeleton, and joint appendages.
The tagma of a crayfish is the Cephalothorax because it is made of two fused segments. The tagma of a crayfish is the Cephalothorax because it is made of two fused segments.
they have 2 i think
No, they are arachnids. Annelids are segmented worms.
A crayfish has one heart that contains two chambers
Backbone and an interior skeleton
it has two
I'm not sure if you mean their common characteristics, or characteristics that they have in common. Some common characteristics are that they have exoskeletons and they are segmented. However, they also have some characteristics that they have in common, and some which no other animals have. One of these characteristics is that they possess biramous appendages, which means legs and other appendages which are forked into two pieces, although some crustaceans lose the minor piece of some legs as they mature. The seoncd thing they all have in common is that all of them first pass through a nauplius larval stage.
realism, naturalism and symbolism
1: No Pulse 2: No beating
They are both insects and are enemies
Circular and Longitudinal muscles.