This is an invertebrate animal with radial symmetry. Most reproduce sexually with external fertilization. This is the simplest invertebrate animal. Most are asymmetrical and reproduce either through asexual means or through internal, self-fertilization because most are hermaphrodites. This is a vertebrate animal with bilateral symmetry which has an endoskeleton. Most reproduce sexually through external fertilization. This is a simple invertebrate animal with radial symmetry. They can reproduce either asexually by budding or sexually through external fertilization called spawning. This is a vertebrate with bilateral symmetry which has an endoskeleton. They reproduce sexually with internal fertilization and live birth. This is an invertebrate with an exoskeleton which has bilateral symmetry. They reproduce sexually with internal fertilization. Submit Answers

Echinoderms are invertebrate animals with radial symmetry. They reproduce mostly through external fertilization. They have endoskeletons that are made up of hardened plates. Examples would be sea stars, sea urchins and sea cucumbers.

The simplest invertebrate animal is the sponge. They have no organs and are considered the most ancient member of the kingdom Animalia. It was once thought to be a plant but the way it takes in food qualified it to be an animal.

Animals in the phylum porifera, more commonly known as sponges are marine animals. They are mostly asymmetrical and they self-fertilize because they are mostly hermaphrodites. In other words, eggs and the sperms are produced by the same organism.

Fish are vertebrate animals that have bodies that are bilaterally symmetrical. They reproduce through external fertilization. They belong in the class called Osteichthyes.

Cnidarians exhibit radial symmetry. They reproduce both asexually and sexually. Budding however is the most important form. They are invertebrates that are known for their central body cavity and stinging cells. Examples would be the jellyfish and the hydra.

Mammals are vertebrates with bilateral symmetry. They have endoskeletons and are known to reproduce sexually through internal fertilization. They give birth to live young. The only mammal that is known to lay eggs is the platypus.

Arthropods are invertebrates with exoskeletons, jointed appendages and segmented bodies. Their bodies show bilateral symmetry. They reproduce sexually. Insects are arthropods, so are crustaceans, arachnids and the like.