Earth’s most incredible feature is the presence of life. The probability of life existing is so small that it is remarkable to exist at all, yet we take it for granted every day. We are surrounded by life everywhere we turn. Plants grow in our gardens, paddocks and forests; birds sit on our power lines; spiders inhabit the corners of our homes; ants find their way into our kitchens; bacteria help us to digest food in our stomachs and intestines. In many ways, life defines this planet, yet so many of us know so little about it. Biology is the field of science that investigates all aspects of life. The life of a human being – biology. Learning about microscopic bacteria, algae, or fungi – biology. Studying how rain and sunlight influences the growth of a plant, this is biology. This field of science incorporates anything and everything imaginable that is related to life on Earth.