Salamander is an example of phylum amphibia. Salamander can survive both in water and on land. They use ir gills when inside water and y use lungs when on land. Their skin is moist.

Most of sponges are asymmetric whereas few sponges are radially symmetrical. For example, in case of sea stars bilateral symmetry is seen in initial stage and radial symmetry in adult forms.

All vertebrates are chordates but vice-versa is not true. Notochord is present during embryonic period. It is replaced by vertebral column in adults. They might also not have post-anal tail after a certain period of time.

Coelomates is also called as Eucoelomates which means true coelom. Body cavity is lined by mesoderm. Internal organs are suspended in coelom and are attached through peritoneum. Hemichordates, chordates, annelids and arthropods are best examples for coelomates.

Arthropoda are triploblastic, segmented and hemocoelomate animals. Their Exoskeleton is made of chitin which helps m from extreme conditions. They are dioecious and internal fertilization is seen in terrestrial arthropods whereas external fertilization is noticed in aquatic arthropods.

Lobe-finned fishes were ancestors of tetrapods. Tetrapoda are classified into 4 sub-classes i.e. Amphibia, Reptilia, Aves and Mammalia. The word tetrapoda means those that have four limbs. Most of m are terrestrial.

In organ level of organization, organs are specialized to perform a specific action. Tissues are grouped to form organs. Example for this level of organization is Platyhelmens.

Most of mollusks don?t exhibit cephalization. Ganglia are present at important parts of ir body. Many of m have eyespots that act as photoreceptors. The anterior head region has sensory tentacles that help in sense of touch.

Coelenterates are acoelomates. Tentacles have stinging capsules called cnidocytes that help in catching of prey. In most of cases, polyp is sessile. Corals have skeleton that is made up of CaCO₃.

Reptiles cannot generate ir body heat internally like humans do. Reptiles cannot sense smell like humans do instead y flick ir tongue out in order to sense chemo receptors. Reptiles derive its origin from word reptum which means creep or crawl. Reptiles are cold blooded animals.