Clitellum

Asking where earthworms live may seem like a silly question. Doesn’t their name say it all? Soil may appear to be a homogeneous place to you...

Charles Darwin is well known for his work on natural selection. He published widely on topics ranging from barnacles to geology to plants. He travelled the...

Adaptation is an evolutionary process whereby an organism becomes increasingly well suited to living in a particular habitat. Natural selection results in helpful traits becoming more...