Amphibians

Amphibians are a class of vertebrates that include frogs, toads, salamanders, and newts. They are known for their ability to live both in water and on land, and undergo a metamorphosis from a water-dwelling larval stage to a land-dwelling adult stage. Here is a study guide to help you understand the key concepts about amphibians:

Characteristics of Amphibians

• Habitat: Amphibians typically live in moist environments such as swamps, streams, and ponds.
• Metamorphosis: They undergo a metamorphosis from an aquatic larval stage with gills to a terrestrial adult stage with lungs.
• Moist Skin: Their skin is smooth, moist, and permeable, allowing them to breathe through their skin.
• Cold-blooded: They are ectothermic, meaning their body temperature is regulated by the environment.
• Life Cycle: Most amphibians lay eggs in water, and their young go through a larval stage before transforming into adults.

Importance of Amphibians

Amphibians play a crucial role in the ecosystem as both predator and prey. They help control insect populations and serve as a food source for other animals.

Threats to Amphibians

Amphibians are facing numerous threats, including habitat loss, pollution, climate change, and the spread of a fungal disease called chytridiomycosis, which has led to population declines and extinctions of many species.

Study Questions

1. What are the key characteristics of amphibians?
2. Describe the process of metamorphosis in amphibians.
3. Why is the permeable skin of amphibians important for their survival?
4. How do amphibians contribute to the ecosystem?
5. What are the main threats to amphibian populations?

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