From termites to humans, here are the answers to some burning questions about creatures big and small.
Evolution has shaped life ever since it first emerged, progressing for more than 2 billion years before the first animals evolved from their primal ancestors. Since then, the animal kingdom has adapted to fill niches nearly everywhere on the planet, from the sea to subterranean tunnels.
Evolution encompasses the changes species undergo over long time periods. It describes how a species' gene pool can gradually change over time, thanks to random DNA mutations or sexual reproduction introducing new genetic combinations. Traits can emerge that help individuals survive to reproduce and pass on their genes to future generations.Nineteenth-century naturalist Charles Darwin used natural selection, or"survival of the fittest," to describe a major aspect of evolution.
Evolution is driven by interactions between genetics and nature, and the Earth's rock layers preserve a record of this process. By studying fossilized remains, scientists can learn about how modern animals evolved. But how these animals came to live where they live, look the way they look, and do the things they do is rarely obvious. By consulting scientific research and news articles, Stacker compiled a list of 25 animal evolution questions and answers to explain some of those mysteries, from why giraffes have such long necks to how ants can carry 50 times their body weight. Read on to find out how evolution has led to the diversity of animals on the planet.
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