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.
• Echinoderms are invertebrate animals with radial symmetry.
• Simplest invertebrate animal is the sponge.
• Animal are asymmetrical.
• Fish are vertebrate animals that have bodies that are bilaterally symmetrical.
• Cnidarians exhibit radial symmetry.
• Mammals are vertebrates with bilateral symmetry.
• Arthropods are invertebrates and they have bilateral symmetry.
Further Explanation:
1. Echinoderms are invertebrate animals with the radial symmetry. They reproduce by external fertilization. They have endoskeletons that are mainly made up of hardened plates.
2. Sponge is a simplest invertebrate. They don’t have any organs and are considered as the most ancient member of the kingdom Animalia.
3. 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.
4. Fish are vertebrate animals that have bodies that are bilaterally symmetrical. They reproduce through external fertilization. They belong in the class called Osteichthyes.
5. Cnidarians exhibit radial symmetry. They reproduce through 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.
6. 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.
7. Arthropods are invertebrates with exoskeletons, jointed appendages and segmented bodies. They show bilateral symmetry and reproduce sexually.
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Answer Details:
Grade: High School
Subject: Biology
Chapter: Animal classification and morphology
Keywords:
Mammals, symmetry, reproduce, sexually, asexually, spore, bilateral, arthropods, invertebrates, fertilization, cell, young, fish, echinoderms.
