What are group of animals under vertebrates?
No, they are not. Vertebrates have vertebra, which are the bones in the spinal column. Arthropods are a group of animals that have no backbone but what's called an exoskeleton. a 'skeleton' outside the body like a shell. No they are invertebrates under the group Arthropoda Arthropods are invertebrates
Animals are divided into two groups, vertebrates and invertebrates. Vertebrates are animals with a backbone and invertebrates are animals without a backbone. In the invertebrates group there are mollusks, Insects, crustaceans and arachnids. Spiders are part of the arachnid group along with scorpions.
That depends on your definition of the word "successful." If you mean which group is more numerous and has populated more of the world, it would be the invertebrates. If you mean which has more higher intelligence, it would be vertebrates. If you mean which group is more essential to the food chain, it would be the invertebrates. If you mean which has the largest animals, it would be the vertebrates. It all depends on…
Sand dollars has a rigid skeleton known as a "test", but these are not backbones so they are invertebrates. Vertebrates are animals that have spinal chords, heads and backbones. Sand dollars are animals related to sea urchins, in a different group called Echinoids. These have none of spinal chords, heads or backbones, so cannot be vertebrates.
Why are there problems with assigning vertebrates to a specific group based on their anatomy and reproduction method?
Vertebrates The vertebrates are animals with a backbone. Scientists separate this group into smaller groups because of their features: how the animal takes in oxygen - lungs, gills or through the skin thermoregulation - maintains own temperature (homeotherms) or temperature varies with surroundings (poikilotherms) reproduction - internal or external fertilisation, lay eggs (oviparous) or give birth to live young (viviparous). Check the link under the related links section for the source.