Evidence might tend to suggest arthropod exoskeletal support is ideal for the role, size, and niche they fill. For smaller organisms the strategy appears to be immensely successful; consider the population and diversity of insects for example. For organisms with increasing sizes, usage of an exoskeleton would quickly become impractical because of the square-cube law; the thickness of the exoskeleton required to support something on land the size of a human or larger would be absurdly great; this has tended to be a limiting factor in the size of arthropods (among other factors, such as their circulatory and respiratory systems).
Correct, backbones are missing from arthropods because they are exoskeletal, having a tough outer skeleton rather than an internal skeleton (endoskeleton) like mammals, reptiles, amphibians, and so forth.
The body of arthropods is physically supported by an external skeleton (exoskeleton) made of a tough protein called chitin. Because it is inflexible, arthropods need to shed it entirely in order to grow in size.
because they have no skeleton.
because it forms the outer skeleton of arthropods including insects..
vertebrates because they do not have an internal skeleton. Instead, they possess an exoskeleton (i.e. a skeleton "on the outside") made of a substance called chitin.invertebrate.vertebrate
Because - they have no internal skeleton.
Evidence might tend to suggest arthropod exoskeletal support is ideal for the role, size, and niche they fill. For organisms with increasing sizes, usage of an exoskeleton would quickly become impractical because of the square-cube law; the thickness of the exoskeleton required to support something on land the size of a human or larger would be absurdly great; this has tended to be a limiting factor in the size of arthropods (among other factors, such as their circulatory system).
An invertebrate is an animal without an internal skeleton. Ants do not have an internal skeleton so they are invertebrates by definition.
invertebrates are different from vertebrates because invertebrates have no backbone or have an outer skeleton. e.g a worm has no backbone e.g arthropods (insects) have an outer skeleton. if you were to stand on an arthropod (but dont because it is awfully cruel) you would hear/feel a crunch because its outer skeleton is breaking. f u
No, catfish aren't arthropods, they have a backbone and are thus in a different phylum, Chordata. Arthropods are characterized by having an exoskeleton; bones for an internal skeleton would indicate a non-arthropod.
Yes - they also have an internal skeleton.
Yes because it has no internal skeleton or backbone.