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Fish are cold-blooded animals that live exclusively in water, while mammals are warm-blooded and can live in various habitats, including land and water. Fish have gills to extract oxygen from water, while mammals have lungs to breathe air.
Fishes are a paraphyletic group, since any clade containing all fish, such as the Gnathostomata or (for bony fish) Osteichthyes, also contains the clade of tetrapods (four-limbed vertebrates, mostly terrestrial), which are usually not considered fish.
Aquatic mammals and semiaquatic mammals are a diverse group of mammals that dwell partly or entirely in bodies of water. They include the various marine mammals who dwell in oceans, as well as various freshwater species, such as the European otter.
29 cze 2022 · The five main groups of vertebrates are fish, amphibians, reptiles, birds, and mammals. There are actually more categories, since bony fish are separate from jawless fish (lampreys and hagfish), cartilaginous fish (sharks and rays), and lobe-fin fish (lungfish and coelacanths).
21 maj 2024 · Dolphin: A marine mammal often confused with fish due to its aquatic lifestyle. Sea snake : A reptile that spends part of its time in the water. Jellyfish : An invertebrate with a gelatinous body and tentacles.
1 cze 2024 · 6 Basic Animal Classes. The 6 Types of Animals: Mammals, Reptiles, Amphibians, and More. ThoughtCo. By. Bob Strauss. Updated on June 01, 2024. Animals are complex, multicellular organisms equipped with nervous systems and the ability to pursue or capture their food, and they can be divided into six broad categories.
29 wrz 2024 · Living fishes represent some five classes, which are as distinct from one another as are the four classes of familiar air-breathing animals—amphibians, reptiles, birds, and mammals. For example, the jawless fishes (Agnatha) have gills in pouches and lack limb girdles.
