![]() ![]() They have smooth, moist skin and breathe through gills, lungs, or their skin. Amphibians are vertebrates that typically live on land but must lay their eggs in water. Examples of fish include salmon, trout, and sharks. ![]() Fish are vertebrates that live in water, breathe through their gills, and have fins and scales. Examples of reptiles include snakes, lizards, and turtles. Reptiles are vertebrates that have dry, scaly skin, and they lay eggs. Examples of birds include chickens, penguins, and eagles. Birds are vertebrates with feathers, beaks, and wings, and they lay eggs. Examples of mammals include humans, dogs, cats, and horses. Mammals are vertebrates that possess hair, mammary glands that produce milk to feed their young, and three middle ear bones. Vertebrates are further divided into five major classes – mammals, birds, reptiles, fish and amphibians. Vertebrates are animals that possess a vertebral column, or backbone, while invertebrates are animals that lack a backbone. Animals can be broadly classified into two major groups – vertebrates and invertebrates. The classification of animals is based on several factors, including their body structure, evolutionary history, and genetic relationships. ![]() In simpler terms, animals are living organisms that are composed of many cells, possess nuclei in their cells, and cannot produce their own food, so they must consume other organisms. Biologically, animals are characterized as organisms that are multicellular, eukaryotic, and heterotrophic. They come in all shapes and sizes, ranging from tiny insects to the largest animal that has ever existed – the blue whale. ![]()
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