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Marine mammals like whales and seals have adaptations for aquatic life, including blubber for insulation and modified limbs for swimming.

Sponges are simple invertebrates with porous bodies and a lack of true tissues and organs. They primarily filter feed.

Arachnids, such as spiders, scorpions, and ticks, have two body segments, four pairs of legs, and no antennae or wings.

Sponges, or Porifera, generally have asymmetric bodies or are radially symmetrical, with no clear left or right sides.

Flatworms are unsegmented, soft-bodied invertebrates with bilateral symmetry and a central nervous system; they can be free-living or parasitic.

Ecdysozoa is a phylum of molting animals that shed their exoskeleton for growth, including arthropods, nematodes, and other similar phyla.

Reptiles are cold-blooded vertebrates with scaly skin. They typically lay soft-shelled eggs on land.

Arthropods are invertebrates with an exoskeleton, segmented body, and jointed appendages. Examples include insects, arachnids, and crustaceans.

Birds are characterized by feathers, a beak without teeth, and the laying of hard-shelled eggs. They are also warm-blooded and most species are capable of flight.

Carnivores have specialized teeth for capturing and eating other animals, prominent canine teeth, and tend to be meat-eaters, like lions and bears.

Marsupials are mammals that give birth to partially developed young that typically complete development in a pouch containing mammary glands, such as kangaroos and koalas.

Crustaceans, such as crabs, lobsters, and shrimp, have a hard exoskeleton, two pairs of antennae, and variously adapted appendages.

Nematodes, or roundworms, have a cylindrical body that is tapered at the ends, a digestive system with two openings, and a pseudocoelom.

The Anura order consists of frogs and toads, which have a short body, no tail, and long hind limbs adapted for leaping.

Cnidarians include jellyfish, corals, and sea anemones, characterized by radial symmetry, a gastrovascular cavity, and cnidocytes for capturing prey.

Mollusks have a soft body with a muscular foot and mantle. Many have a calcium carbonate shell, and they include snails, clams, and squids.

Chordates possess a notochord, a dorsal hollow nerve cord, pharyngeal slits, and a post-anal tail at some point in their lives.

Symbiosis in animals includes mutualism, commensalism, and parasitism, where different species live together with varying effects on each other.

Invertebrates do not have a backbone, while vertebrates do. Over 90% of all animal species are invertebrates.

Rodents, like mice and beavers, have continuously growing incisors which they use for gnawing, and lack canine teeth.

The Caudata order, comprising salamanders and newts, is characterized by elongated bodies, tails, and moist, glandular skin.

Chondrichthyes includes sharks, rays, and skates and is distinguished by a cartilaginous skeleton and the absence of swim bladders.

Diplopoda, commonly known as millipedes, are characterized by their elongated bodies with two pairs of legs per body segment.

Bilateral symmetry offers advantages in movement and sensory perception, often associated with cephalization and increased mobility.

Detritivores, like earthworms and millipedes, consume decomposing organic matter, contributing to nutrient cycling and soil formation.

Annelids or segmented worms have a body made up of repeating segments, a true coelom, and include earthworms and leeches.

Sponges reproduce both sexually, by releasing gametes into the water, and asexually, by budding or fragmentation.

Chilopoda, known as centipedes, have flat, segmented bodies with one pair of legs per segment and are carnivorous.

Echinoderms, such as sea stars and sea urchins, have radial symmetry, a calcareous endoskeleton, and tube feet for locomotion.

Class Mammalia includes humans, characterized by hair or fur, three middle ear bones, and the production of milk by mammary glands.

Sarcopterygii, or lobe-finned fishes, possess fleshy pectoral and pelvic fins and include the coelacanths and lungfishes.

Mammals are warm-blooded vertebrates with hair or fur and females that produce milk for their young using mammary glands.

Insects are arthropods with a three-part body (head, thorax, abdomen), three pairs of legs, compound eyes, and one pair of antennae.

Aves is the class of animals comprising all birds, with characteristics like feathers, beaks, and a high metabolic rate.

Cetaceans, which include whales, dolphins, and porpoises, are fully aquatic mammals with a streamlined body shape and a blowhole for breathing.

The Squamata order includes lizards and snakes, which have scales and shed their skin periodically.

Actinopterygii, or ray-finned fishes, make up the majority of fish species and are characterized by their fins supported by bony or cartilaginous spines.

Amphibians are cold-blooded vertebrates that begin life in water with gills and undergo metamorphosis to develop lungs for breathing air.

Fish are cold-blooded vertebrates living in water, with gills for breathing and usually having scales covering their bodies.

Primates have a large brain relative to body size, binocular vision, flexible hands and feet, and complex social behaviors.

Testudines, such as turtles and tortoises, are reptiles with a bony or cartilaginous shell developed from their ribs.

Gymnophiona, or caecilians, are legless amphibians with a worm-like appearance and live in burrowing and aquatic habitats.

Artiodactyls, or even-toed ungulates, have weight borne equally by the third and fourth toes. Examples include deer, cattle, and pigs.

Perissodactyls are odd-toed ungulates with a majority of weight on the third toe, including horses, rhinos, and tapirs.

Predators hunt and consume other organisms, while their prey serve as their food source, influencing population dynamics and evolution.

Monotremes are egg-laying mammals, such as the platypus and echidnas, with a cloaca and lactation without defined nipples.