Biodiversity is increased by the formation of new species (speciation) and decreased by the loss of species (extinction).<br /><br />Khan Academy is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We offer quizzes, questions, instructional videos, and articles on a range of academic subjects, including math, biology, chemistry, physics, history, economics, finance, grammar, preschool learning, and more. We provide teachers with tools and data so they can help their students develop the skills, habits, and mindsets for success in school and beyond. Khan Academy has been translated into dozens of languages, and 15 million people around the globe learn on Khan Academy every month. As a 501(c)(3) nonprofit organization, we would love your help! <br /><br />Donate or volunteer today! Donate here: <a href="https://www.khanacademy.org/donate" target="_blank" rel="nofollow">https://www.khanacademy.org/donate</a><br /><br /> Volunteer here: <a href="https://www.khanacademy.org/contribute" target="_blank" rel="nofollow">https://www.khanacademy.org/contribute</a><br />...<br /><a href="https://www.youtube.com/watch?v=TZ-S9sc6HYM" target="_blank" rel="nofollow">https://www.youtube.com/watch?v=TZ-S9sc6HYM</a><br />Note: All Khan Academy content is available for free at (www.khanacademy.org)