Earth’s magnetic field plays a key role in ... of oxygen in the atmosphere and the ocean increased. These weird animals barely resembled life today — squashy fans, tubes and doughnuts, and ...

The article introduces various animals with names and appearances reminiscent of horror fiction. These creatures, ranging ...

Evolution is responsible for some weird animals on Earth, but this two-armed worm might just be the weirdest. Following is a transcript of the video. This creature is like a worm with two little arms!

an eruption of life when Earth’s very first animals began appearing in the fossil record — the ancestors of all major animal groups that we know today. The Cambrian sea was a very strange and ...

Life on Earth would be so dull without animals. Lucky for us, there are more than 8 million different species of them on the ...

Only vertebrate animals have real teeth, though some invertebrates have ... Once their permanent tusks come in, they grow at a rate of about 6.7 inches per year. One of the strangest tusks — the ...