Wolves and the Balance of Nature
ReadOasis Step 2 Yellowstone is a large park in the northern US. It became a National Park in 1872. This means the government protects the natural beauty and animals of the park. But in 1914, the government paid to kill all the predators in Yellowstone. Predators eat other animals.... Read more
The Power of Wind
By Tek Smith ReadOasis Step 1 In August 2003, electrical power went out in a large part of North America. Ten million people in Ontario, Canada, lost power. And the lights went out for forty-five million people in eight states in the U.S. Eleven people died in relation to... Read more
Evolution by Natural Selection
ReadOasis Step 3 Evolution is a process of how living things change over time. Natural selection is the basic mechanism of evolution. It was introduced by Charles Darwin in 1859. He compared natural selection with artificial selection. In artificial selection, humans choose traits for breeding. For example, we can... Read more
The Most Poisonous Animal
By Cana Short ReadOasis Step 3 One day Rachael Shardlow was swimming in the sea, near the mouth of the Calliope River in eastern Australia. Suddenly, she felt something wrap around her legs. A stinging pain shot through her body. Almost instantly, she couldn't see or breathe. Her brother... Read more