An exoskeleton is an external skeleton that protects and supports the animal's body. Two phyla that have exoskeletons are Arthropoda and Heterokontophyta.
Two features defining the animal phyla are adult body plans and patterns of embryological development.
Arachnids and Platyhelminthes are two types of animal phyla even though there are many more.
Most animal phyla exhibit bilateral symmetry, where the body can be divided into two mirror-image halves along a single plane. This body plan is thought to have evolved for efficient movement and coordination in organisms.
The two animal phyla that show radial symmetry are Cnidaria (such as jellyfish and sea anemones) and Echinodermata (such as starfish and sea urchins). Radial symmetry means that the body parts are arranged symmetrically around a central axis, like spokes on a wheel.
Cnidaria and Ctenophora are the two phyla that are diploblastic, meaning they have two germ layers during embryonic development – the ectoderm and endoderm.
There are more than two phyla in the animal kingdom... There are many phyla in the animal kingdom. There are a few phyla of worms and other invertebrates and then you have the vertebrate ohyla. Unless that's what your asking? Did you want the invertebrate and vertebrate in general phyla? That's the only set of 2 things I can think of.
Two features defining the animal phyla are adult body plans and patterns of embryological development.
arthopoda and mullasca
No, arthropoda and platyhelminthes are two different phyla. The latter are the flatworms, the former are characterized by segmented bodies, an exoskeleton made from chitin, and joint appendages, and include insects and crustaceans.
An arthropod is an invertebrate animal with an exoskeleton , a segmented body, and jointed appendages.
Arachnids and Platyhelminthes are two types of animal phyla even though there are many more.
actually seven of the 9 phyla use extracellular digestion. the two that are intracellular are porifera and placozoa
A starfish is actually an echinoderm. Its Its water vascular system and lack of segmentation, or even an exoskeleton composed of chitin, mean that it is not an arthropod in ANY sense...two completely different phyla.
The animal you are describing is likely a blue crayfish. They have a hard exoskeleton that is bluish-black in color.
Most animal phyla exhibit bilateral symmetry, where the body can be divided into two mirror-image halves along a single plane. This body plan is thought to have evolved for efficient movement and coordination in organisms.
The two animal phyla that show radial symmetry are Cnidaria (such as jellyfish and sea anemones) and Echinodermata (such as starfish and sea urchins). Radial symmetry means that the body parts are arranged symmetrically around a central axis, like spokes on a wheel.
Cnidaria and Ctenophora are the two phyla that are diploblastic, meaning they have two germ layers during embryonic development – the ectoderm and endoderm.