Animal Classification

What are the characteristics of cnidarians?

• Bilateral symmetry, stingers with cnidocytes, and a complex nervous system.

• Asymmetrical shape, no tentacles, and a well-developed brain.

• Radial symmetry, tentacles with cnidocytes, and a simple nerve net.

• Spherical body, no stingers, and a closed circulatory system.

Name three examples of vertebrates.

• Amphibians

• Reptiles

• 1. Fish 2. Birds 3. Mammals

• Invertebrates

What is the main difference between vertebrates and invertebrates?

• Ability to fly

• Number of legs

• Size of the organism

• Presence of a backbone or spinal column

How do arthropods protect themselves?

• Camouflage, mimicry, chemical defense, and physical adaptations like hard exoskeletons

• Loud vocalizations

• Heat resistance

• Flying ability

What are the main characteristics of sponges?

• Complex, single-celled organisms with non-porous bodies and no specialized feeding cells.

• Simple, multicellular animals with porous bodies and specialized cells for filter feeding.

• Photosynthetic, plant-like organisms with rigid structures and no ability to move.

• Highly intelligent, multicellular animals with exoskeletons and no need for filter feeding.

What is the largest group of invertebrates?

• Chordata

• Echinodermata

• Arthropoda

• Mollusca

Name three examples of cnidarians.

• Seals, sea lions, walruses

• Sharks, dolphins, whales

• Jellyfish, sea anemones, corals

• Starfish, sea urchins, sea cucumbers

What are the main characteristics of vertebrates?

• Animals with exoskeletons

• Animals with a backbone or spinal column, well-developed brain and complex nervous system, closed circulatory system, and bony or cartilaginous skeleton.

• Animals with no nervous system

• Animals with open circulatory system

What are the main characteristics of invertebrates?

• Invertebrates have a backbone and make up about 50% of all animal species.

• Invertebrates are all warm-blooded animals.

• Invertebrates are only found in the ocean.

• Invertebrates lack a backbone or spinal column and make up about 97% of all animal species.

How do arthropods contribute to the ecosystem?

• Arthropods contribute to the ecosystem by serving as decomposers, pollinators, and a food source for other animals.

• Arthropods contribute to the ecosystem by causing harm to other species

• Arthropods contribute to the ecosystem by disrupting the balance of the food chain

• Arthropods contribute to the ecosystem by competing with other animals for resources