https://www.khanacademy.org/science/ms-biology/x0c5bb03129646fd6:interactions-in-ecosystems/x0c5bb03129646fd6:populations-communities-and-ecosystems/v/ms-populations-communities-and-ecosystems 2022-10-21T22:40:33.613234713Z Populations, communities, and ecosystems Organisms, and populations of organisms, are dependent on their environmental interactions both with other living things and with nonliving factors. Sal Khan video https://cdn.kastatic.org/ka_thumbnails_cache/5672b967-c8cc-46f0-ba8b-431eb788378e_1280_720_base.png Populations, communities, and ecosystems Organisms, and populations of organisms, are dependent on their environmental interactions both with other living things and with nonliving factors. https://cdn.kastatic.org/ka-youtube-converted/xzINev2Bd8s.mp4/xzINev2Bd8s.mp4 226 Different Ecosystems https://www.khanacademy.org/science/hs-bio/x230b3ff252126bb6:ecology-and-natural-systems/x230b3ff252126bb6:organization-of-natural-systems/v/biotic-and-abiotic-factors-in-earths-natural-systems 2024-05-28T21:41:02.467178644Z Biotic and abiotic factors in Earth’s natural systems Natural systems are made up of both biotic factors (living organisms and their interactions) and abiotic factors (non-living parts of the environment such as sunlight and temperature). Earth can be divided into four systems, called spheres: the atmosphere (gases surrounding Earth), the biosphere (all living organisms), the geosphere (Earth's interior and surface), and the hydrosphere (all forms of water). Sal Khan video https://cdn.kastatic.org/ka_thumbnails_cache/1b8f7160-2496-44ec-8a88-7e34c7fc5c26_1280_720_base.png Biotic and abiotic factors in Earth’s natural systems Natural systems are made up of both biotic factors (living organisms and their interactions) and abiotic factors (non-living parts of the environment such as sunlight and temperature). Earth can be divided into four systems, called spheres: the atmosphere (gases surrounding Earth), the biosphere (all living organisms), the geosphere (Earth's interior and surface), and the hydrosphere (all forms of water). https://cdn.kastatic.org/ka-youtube-converted/GxKWCiZHsvo.mp4/GxKWCiZHsvo.mp4 314 Different Ecosystems https://www.khanacademy.org/science/revision-term-2-tg-biology-class-8/x04828215b460a495:week-1/x04828215b460a495:different-ecosystems/v/interactions-between-organisms 2025-10-01T04:00:43.064865848Z Interactions between Organisms This video talks about how biotic (living) and abiotic (non-living) parts of nature team up to form ecosystems—from ponds to forests to farms. In this video, you'll learn: 1. The difference between biotic and abiotic components. 2. Define an ecosystem and spot its types: aquatic, terrestrial, and human-made . 3. Understand biotic–abiotic biotic–biotic interactions and abiotic–abiotic interactions with examples 4. Understand how these interactions keep ecosystems balanced Khan Academy video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Interactions between Organisms This video talks about how biotic (living) and abiotic (non-living) parts of nature team up to form ecosystems—from ponds to forests to farms. In this video, you'll learn: 1. The difference between biotic and abiotic components. 2. Define an ecosystem and spot its types: aquatic, terrestrial, and human-made . 3. Understand biotic–abiotic biotic–biotic interactions and abiotic–abiotic interactions with examples 4. Understand how these interactions keep ecosystems balanced https://cdn.kastatic.org/ka-youtube-converted/PBZrMu1UN5c.mp4/PBZrMu1UN5c.mp4 478 Different Ecosystems https://www.khanacademy.org/science/revision-term-2-tg-biology-class-8/x04828215b460a495:week-1/x04828215b460a495:different-ecosystems/e/interactions-among-organisms 2026-04-07T23:55:07.30621384Z Interactions among organisms Explore how interactions in an ecosystem create benefits such as soil protection by roots, oxygen release by plants, cooling and moisture retention under trees, and the role of abiotic–abiotic relations like sunlight and wind. This exercise helps Class 8 students identify biotic–abiotic, abiotic–abiotic, and biotic–biotic interactions and understand their importance for ecosystem balance. Yajurva Joshi exercise https://www.khanacademy.org/science/revision-term-2-tg-biology-class-8/x04828215b460a495:week-1/x04828215b460a495:different-ecosystems/v/balance-in-an-ecosystem 2025-10-12T15:01:17.33690735Z Balance in an Ecosystem Explore how interactions between different organisms of our planet keep our ecosystems healthy and balanced. Khan Academy video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Balance in an Ecosystem Explore how interactions between different organisms of our planet keep our ecosystems healthy and balanced. https://cdn.kastatic.org/ka-youtube-converted/Dert3xLqikw.mp4/Dert3xLqikw.mp4 206 Different Ecosystems https://www.khanacademy.org/science/revision-term-2-tg-biology-class-8/x04828215b460a495:week-1/x04828215b460a495:different-ecosystems/e/how-do-interactions-maintain-balance-in-an-ecosystem 2026-04-08T00:54:09.631945657Z How do interactions maintain balance in an ecosystem? Engaging Class 8 Science exercise on ecosystem balance. Covers competition, mutualism, commensalism, parasitism, and real-life examples through MCQs, T/F, match, and scenarios. Yajurva Joshi exercise https://www.khanacademy.org/science/revision-term-2-tg-biology-class-8/x04828215b460a495:week-1/x04828215b460a495:different-ecosystems/e/trees-shrubs-and-herbs 2026-04-07T23:55:07.30621384Z Habitat of living beings LO1: Habitat of living beings LO2: Animals and plants found in different environments Revathi exercise https://www.khanacademy.org/science/revision-term-2-tg-biology-class-8/x04828215b460a495:week-1/x04828215b460a495:different-ecosystems/e/aquatic-habitat 2026-04-08T01:15:04.085520103Z Aquatic Habitat Ever peeked into a pond and seen dragonflies darting, lotus leaves floating, or frogs leaping near the edge? A pond is a bustling little water world! In this exercise, you’ll explore who lives where in the pond and why. Bitasta Datta exercise https://www.khanacademy.org/science/revision-term-2-tg-biology-class-8/x04828215b460a495:week-1/x04828215b460a495:different-ecosystems/e/terrestrial-habitat 2026-04-06T02:41:58.374508961Z Terrestrial Habitat Have you ever spotted a squirrel racing up a tree or your pet dog curling near your feet? From trees to houses to giant orchards—terrestrial habitats are all around us! In this activity, you’ll explore how trees, homes, and fields become cozy shelters for all sorts of creatures. Bitasta Datta exercise https://www.khanacademy.org/science/revision-term-2-tg-biology-class-8/x04828215b460a495:week-1/x04828215b460a495:different-ecosystems/v/food-chain-and-food-webs 2025-07-13T07:33:51.252224157Z Food Chain and Food Webs Why do people around the world eat different kinds of food? In this video, we’ll explore how geography and climate shape food habits and determine staple foods like rice, wheat, or maize. Discover how cultural and regional factors affect our diets and eating patterns. We’ll also discuss the importance of a balanced meal and how it supports good health. Khan Academy video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Food Chain and Food Webs Why do people around the world eat different kinds of food? In this video, we’ll explore how geography and climate shape food habits and determine staple foods like rice, wheat, or maize. Discover how cultural and regional factors affect our diets and eating patterns. We’ll also discuss the importance of a balanced meal and how it supports good health. https://cdn.kastatic.org/ka-youtube-converted/HRyjMbuMDn0.mp4/HRyjMbuMDn0.mp4 449 Different Ecosystems https://www.khanacademy.org/science/revision-term-2-tg-biology-class-8/x04828215b460a495:week-1/x04828215b460a495:different-ecosystems/e/food-chain-and-webs-in 2026-03-06T17:50:38.494926415Z Food chain and webs Let's solve some questions! vibhor exercise