https://www.khanacademy.org/science/revision-term-1-ka-biology-grade-11/x1474e0ca4285b2f5:week-1/x1474e0ca4285b2f5:animal-kingdom/e/porifera-cnidaria-and-ctenophora 2024-08-15T06:03:54.799148768Z Porifera, Cnidaria, and Ctenophora This exercise explores the salient features of the phyla Porifera, Cnidaria, and Ctenophora. Moumita Sen exercise https://www.khanacademy.org/science/6th-grade-science-matatag/x1c42f0f13f909d5b:2nd-quarter/x1c42f0f13f909d5b:vertebrates-and-invertebrate-animals/v/phylum-platyhelminthes 2023-05-02T06:33:07.024761773Z Phylum Platyhelminthes Find out about tapeworms and more. Moumita Sen video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Phylum Platyhelminthes Find out about tapeworms and more. https://cdn.kastatic.org/ka-youtube-converted/ZL6s3qMJruk.mp4/ZL6s3qMJruk.mp4 469 Animal Kingdom https://www.khanacademy.org/science/6th-grade-science-matatag/x1c42f0f13f909d5b:2nd-quarter/x1c42f0f13f909d5b:vertebrates-and-invertebrate-animals/v/phylum-arthropoda-part-1 2023-05-03T21:01:13.225276573Z Phylum Arthropoda - part 1 Let's look at the general characteristics and the respiratory organs of the members of the phylum Arthropoda. Moumita Sen video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Phylum Arthropoda - part 1 Let's look at the general characteristics and the respiratory organs of the members of the phylum Arthropoda. https://cdn.kastatic.org/ka-youtube-converted/KbVX6Mb9dKQ.mp4/KbVX6Mb9dKQ.mp4 346 Animal Kingdom https://www.khanacademy.org/science/biology-essentials/x35f699f4a3703d4e:untitled-50/x35f699f4a3703d4e:lower-animals/v/phylum-arthropoda-part-2 2023-05-03T21:01:13.225276573Z Phylum Arthropoda - part 2 Let's look at the sense organs and the excretory system of Arthropods. Moumita Sen video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Phylum Arthropoda - part 2 Let's look at the sense organs and the excretory system of Arthropods. https://cdn.kastatic.org/ka-youtube-converted/nUmpcxLe9Qc.mp4/nUmpcxLe9Qc.mp4 263 Animal Kingdom https://www.khanacademy.org/science/biology-essentials/x35f699f4a3703d4e:untitled-50/x35f699f4a3703d4e:lower-animals/e/platyhelminthes-nematoda-annelida-arthropoda-mollusca 2026-04-08T00:16:02.937952483Z Platyhelminthes, Nematoda, Annelida, Arthropoda, Mollusca This article tests the ability to distinguish between the salient features of Platyhelminthes, Nematoda, Annelida, Arthropoda, and Mollusca. Moumita Sen exercise https://www.khanacademy.org/science/biology-essentials/x35f699f4a3703d4e:untitled-50/x35f699f4a3703d4e:higher-animals/v/chondrichthyes-and-osteichthyes 2023-05-04T21:01:09.147807763Z Chondrichthyes and Osteichthyes Let's look at the similarities and differences between cartilaginous and bony fishes. Moumita Sen video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Chondrichthyes and Osteichthyes Let's look at the similarities and differences between cartilaginous and bony fishes. https://cdn.kastatic.org/ka-youtube-converted/77pxrS8I2qg.mp4/77pxrS8I2qg.mp4 465 Animal Kingdom https://www.khanacademy.org/science/jnv-biology-grade-11-revision-course-full-term/x3ed1e7eacb19007a:week-1/x3ed1e7eacb19007a:untitled-473/v/mammals 2025-10-01T19:00:52.430915626Z Mammals From the tiniest shrews to the largest whales, one group of animals rules almost every corner of our planet. But what exactly makes them so unique? Why do they thrive in such different environments — and what secrets lie behind their success? Let’s dive in and explore the story of mammals. Khan Academy video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Mammals From the tiniest shrews to the largest whales, one group of animals rules almost every corner of our planet. But what exactly makes them so unique? Why do they thrive in such different environments — and what secrets lie behind their success? Let’s dive in and explore the story of mammals. https://cdn.kastatic.org/ka-youtube-converted/JWEa_cemjmk.mp4/JWEa_cemjmk.mp4 460 Animal Kingdom https://www.khanacademy.org/science/biology-essentials/x35f699f4a3703d4e:untitled-50/x35f699f4a3703d4e:higher-animals/e/vertebrates 2026-04-08T00:54:09.631945657Z Vertebrates This exercise tests the salient features of vertebrates and the differences between Chondrichthyes, Osteichthyes, Amphibia, Reptilia, Aves, and Mammalia. Moumita Sen exercise