【生物基礎】　生態系3　キーストーン種　（１２分）

Watch all the lessons from Try's talented instructors for free! Try IT video lessons for junior high and high school students are designed to be easy to understand! You can use them to prepare and review for school, as well as for regular tests and exam preparation. The lessons are taught by top instructors with plenty of teaching experience, who are known for their fun and easy-to-understand teaching methods. *This lesson is a video created during the old curriculum. *Please be careful when watching it to prepare for entrance exams or regular tests for the new curriculum. If you watch the video and think, "It's easy to understand!" or "I want to take a class like this!", Try's individual instruction may be right for you. For details on Try's individual instruction service, to request materials, or to contact us, please click here. https://bit.ly/4hjhKSE Moreover +‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥+ Try offers free video lessons, "Try IT," to support home learning. "Try IT" is available free of charge to non-members as well. Please use it to prepare for exams and improve your home study. Click here for the official Try IT video lesson website: https://bit.ly/4jLULBg +‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥+ In this video lesson, you can learn about "Basic Biology: Ecosystem 3: Keystone Species" in about 12 minutes. The main point of this lesson is that "keystone species are species that are at the top of the food web and are essential to maintaining the ecosystem." You can watch the lesson on "Biomes and their distribution" here. If you have any questions about a unit other than this one, please click on the URL below. You can watch the video lessons for each unit together. ■If you have any questions about "Basic Biology," click here! ・Basic biology: Cell structure https://goo.gl/n0Ttrf ・Basic biology: Cells and energy https://goo.gl/ceGVQS ・Basic biology: Genetics and genes https://goo.gl/B3iKqw ・Basic biology: Protein structure and function https://goo.gl/OmeUTf ・Basic biology: DNA replication and cell division https://goo.gl/tEY8Mk ・Basic biology: Genes and genomes https://goo.gl/CNEm80 ・Basic biology: Body fluids and their functions https://goo.gl/6ODkJv ・Basic biology: Immunity https://goo.g l/OK0Rx3 ・Bio Basics: Circulation of body fluids and the liver https://goo.gl/FNUxAe ・Bio Basics: How body fluid concentration is regulated https://goo.gl/yC3539 ・Bio Basics: Nerves and hormones https://goo.gl/QRhUc2 ・Bio Basics: The origins of vegetation and fibers https://goo.gl/PE56LQ ・Bio Basics: Biomes and their distribution https://goo.gl/52LSHc ・Bio Basics: Ecosystems and material and energy cycles https://goo.gl/4ErZnQ ・Bio Basics: Ecosystem balance and conservation https://goo.gl/ADeSMM