Animals with a backbone are called vertebrates. Animals without a backbone are called invertebrates. Vertebrates and invertebrates can be sorted into smaller groups. Vertebrates, for example ...

uterine and smooth), from lower classes within the vertebrate phylum (amphibian, fish and cyclostome) and from representatives of different invertebrate phyla (arthropod, mollusc, echinoderm ...

Vertebrates are animals that have a backbone inside their body. The major groups include fish, amphibians, reptiles, birds and mammals. Invertebrates don't have a backbone. They either have a soft ...

But not all scientists agree that invertebrates feel anything analogous to vertebrate—much less human—emotion. Frans de Waal, a primatologist and animal behaviorist at Emory University, and Kristin ...

Figure 2: Relationships among animal phyla and subphyla with ... and function of immune cells in jawless vertebrates and closely related invertebrates have elucidated, and continue to elucidate ...

Madagascar hissing cockroaches are one of many fascinating animal species to hail from ... of the respiratory system is far more common in vertebrates. Like 99 percent of all cockroach species ...

and animal-based research continues to be critical in the search for treatments and cures for many diseases including cancer, heart disease, neurodegenerative diseases and infectious diseases. All use ...

"Retrotransposons compose about 40% of our genomes, but nothing is known about how they might have helped animals ... of ...