Answer: the <span>Permian–Triassic extinction event ; {"end of the Permian era"} .
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Answer:
Infectious diseases are diseases caused by living organisms like viruses and bacteria. They can be passed from person to person through body secretions, insects or other means. Examples are SARS, influenza, the common cold, tuberculosis (TB), Hepatitis A and B.
Amphibians are referred to as the "planet's greatest survivors" because they have repeatedly avoided extinction over the course of 400 million years.
<h3>How did the amphibians survive?</h3>
Over the years, the amphibians have had to adapt to various surroundings. Small animals called amphibians require water or a moist environment to exist. This group of species includes newts, salamanders, toads, and frogs. All have extremely thin skin that allows them to breathe and absorb water. Additionally, amphibians have unique skin glands that create functional proteins.
According to fossil evidence, amphibians descended from lobe-finned lungfish about 365 million years ago. They were very successful since they were the first terrestrial vertebrates. Some of them were considerably bigger than modern-day amphibians. The predominant group of land vertebrates for more than 100 million years was amphibians.
Learn more about amphibians here:
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The disadvantage of wolf captivation is that it restricts the sample size which prevents to make a conclusion on the species.
Explanation:
To study the behavior of the wolves that are kept in captivation during their feeding times, food enrichment programmes are performed. The feeding sessions were proved to be quite useful in studying the stereotype behavior of the wolf.
However, this study is experimented on small samples and on restricted environment that doesn’t represent the actual environment of a zoo where wolves are allowed to behave as per their nature.
