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Answer key

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Chapter: 03. Kingdom Animalia

Adult amphibians breathe through their lungs when on land and through their slimy skin when in water.
Hydra and sea anemone are two examples of organisms belonging to the phylum Coelenterata.
The body of an insect is divided into the head, the thorax, and the abdomen.
Vertebrates possess an internal vertebral column or backbone, which is entirely absent in invertebrates.
Whales and dolphins are classified as mammals because they have hair on their bodies and possess mammary glands to feed their young.
Starfish and sea urchin are two examples of animals belonging to the phylum Echinodermata.
Ascaris, hookworms, and threadworms are disease-causing parasites belonging to the phylum Nemathelminthes.
Reptiles are cold-blooded because their body temperature changes in response to changes in the environmental temperature.
Poriferans are mainly found in the sea attached to the bottom, though a few species occur in freshwater.
Molluscs utilize a muscular foot for locomotion.
The bat is the only flying mammal.
The tapeworm absorbs digested food directly through its segments from the host’s intestine.
The earthworm makes the soil porous and fertile through its burrowing and soil-feeding habits, which increases aeration and water absorption.
Mammals are characterized by a body covered with hair and the presence of projecting external ears.
Arachnids have six pairs of appendages including four pairs of walking legs, whereas insects have three pairs of legs and normally two pairs of wings.
The large pore or opening at the top of a sponge’s body is used to expel the water drawn in through its smaller body pores.
Fishes breathe in water through special respiratory organs called gills.
Segmented worms utilize special excretory organs called nephridia to eliminate waste.
Reptiles lay their leathery eggs on dry land, whereas amphibians return to water to lay their eggs.
Birds possess claws on their feet that are specifically adapted for perching on trees.
 
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