the mayfly: ecology of an aquatic insect - part 6 of 25. because its life cycle includes both aquatic and aerial states, the mayfly is an excellent indicator of water quality in rivers and lakes. through superb photography, this film reveals the mayfly he - 生物學家 個影片檔及 b 捲影像00:36
scientist dissecting and testing fish for radioactivity in a laboratory / united kingdom - 生物學家 個影片檔及 b 捲影像00:16
scientists collecting samples of marine life, including seaweed and fish, to test for radioactivity near a nuclear processing facility / united... - 生物學家 個影片檔及 b 捲影像00:23
cu r/f woman examining dna molecule rotating on computer screen / atlanta, georgia, usa - 生物學家 個影片檔及 b 捲影像00:06
cu td reflection of woman examining dna molecule rotating on computer screen / atlanta, georgia, usa - 生物學家 個影片檔及 b 捲影像00:05
cu tu woman examining dna molecule rotating on computer screen / atlanta, georgia, usa - 生物學家 個影片檔及 b 捲影像00:10
cu ds woman examining dna molecule rotating on computer screen / atlanta, georgia, usa - 生物學家 個影片檔及 b 捲影像00:16
cu zo woman examining dna molecule rotating on computer screen / atlanta, georgia, usa - 生物學家 個影片檔及 b 捲影像00:10