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Which of the following is not an amphibian?
- Frog
- Lizard
- Salamander
- Toad
Amphibians are cold-blooded vertebrate animals of a class that comprises frogs, toads, newts, salamanders, and caecilians.
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What is the life cycle of most amphibians?
- Egg, larva, adult
- Pupa, caterpillar, butterfly
- Larva, pupa, adult
- Embryo, young, adult
Most amphibian species have a life cycle that involves three stages, egg, larva, and adult. All amphibians start life as an egg in a ball of jelly. The eggs are laid in water.
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What is the main reason amphibians lay their eggs in water?
- To protect the eggs from predators
- To provide a source of food for the larva
- To ensure the eggs stay moist
- To make sure the eggs stay out of sunlight
Unlike other tetrapod vertebrates (reptiles, birds, and mammals), amphibians do not produce amniotic eggs. Therefore, they must lay their eggs in water so they won’t dry out.
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What is unique about the skin of amphibians?
- It is covered in scales
- It is slimy and moist
- It is dry and rough
- It is dry and feathery
In order to absorb oxygen, the skin of an amphibian has to stay wet. They secrete mucous to keep the skin moist.
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Why are amphibians considered indicator species?
- Because they have a unique mating call
- Because they can be easily trained
- Because they are growing old very fast
- Because they are sensitive to changes in the environment
Amphibians are considered indicator species because they are extremely sensitive to changes in the environment. Some of the threats they face are habitat loss, invasive species, pollution, infectious diseases, and climate change.
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