Invertebrate doesn't posses "Backbone" whereas Vertebrate chordate have that. That's the only & most important difference between them.
Hope this helps!
I think b would fit more as the mitochondria, d would be the endoplasmic reticulum, and e would be lysosomes
The number of legs that an arthropod has is a very useful characteristic for classifying them into different classes. Insects always have six legs<span> (three pairs) and arachnids have </span>eight legs<span> (four pairs). Crustaceans have at least </span>eight legs<span> and often more, while myriapods can have up to a hundred legs!</span>
Antibiotics are powerful medicines that fight bacterial infections. Used properly, antibiotics can save lives. They either kill bacteria or keep them from reproducing. Your body's natural defenses usually take it from there. Antibiotics do not kill viruses.
