Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: Introduction to cell theory–the idea that 1) all living things are made of one or more cells, 2) cells are the basic unit of life and 3) all cells come from other cells. Explore the roles that Hooke, Leeuwenhoek and others played […]
Tag: online learning
Origins of life | Biology | Khan Academy
An overview of the question of how life first arose on Earth. Watch the next lesson: Missed the previous lesson? Watch here: Biology on Khan Academy: Biology, defined as the scientific study of life, is an incredibly broad and diverse field. In many ways, it’s as kaleidoscopic and rich as living organisms themselves. Biologists study […]