man spins wood attempting to light fire with kindling, amazon rainforest, venezuela - 木質部 個影片檔及 b 捲影像00:22
man chops pointed end of wooden pole with machete, amazon rainforest, venezuela - 木質部 個影片檔及 b 捲影像00:09
tilt down from wooden ceiling of large shelter to hammocks hung from wooden frame, venezuela - 木質部 個影片檔及 b 捲影像00:13
all living things depend, directly or indirectly, on green plants for food and oxygen. this film clarifies the difference between food and raw... - 木質部 個影片檔及 b 捲影像00:36
trees and their importance - part 7 of 22. the theme of this film is conservation, with emphasis on the importance of trees as a renewable resource, and their role in water and soil conservation. a number of animated sequences showing the life processes o - 木質部 個影片檔及 b 捲影像00:32
trees and their importance - part 6 of 22. the theme of this film is conservation, with emphasis on the importance of trees as a renewable resource, and their role in water and soil conservation. a number of animated sequences showing the life processes o - 木質部 個影片檔及 b 捲影像00:29
trees and their importance - part 5 of 22. the theme of this film is conservation, with emphasis on the importance of trees as a renewable resource, and their role in water and soil conservation. a number of animated sequences showing the life processes o - 木質部 個影片檔及 b 捲影像00:27
evolution of vascular plants: the ferns - part 28 of 28. describes the evolution of vascular systems in land plants. the highly specialized structures that occur in vascular plants are shown through investigation of the fern. explains the adaptive advanta - 木質部 個影片檔及 b 捲影像00:28草地
evolution of vascular plants: the ferns - part 27 of 28. describes the evolution of vascular systems in land plants. the highly specialized structures that occur in vascular plants are shown through investigation of the fern. explains the adaptive advanta - 木質部 個影片檔及 b 捲影像00:32
evolution of vascular plants: the ferns - part 26 of 28. describes the evolution of vascular systems in land plants. the highly specialized structures that occur in vascular plants are shown through investigation of the fern. explains the adaptive advanta - 木質部 個影片檔及 b 捲影像00:31
evolution of vascular plants: the ferns - part 25 of 28. describes the evolution of vascular systems in land plants. the highly specialized structures that occur in vascular plants are shown through investigation of the fern. explains the adaptive advanta - 木質部 個影片檔及 b 捲影像00:38
evolution of vascular plants: the ferns - part 24 of 28. describes the evolution of vascular systems in land plants. the highly specialized structures that occur in vascular plants are shown through investigation of the fern. explains the adaptive advanta - 木質部 個影片檔及 b 捲影像00:29
evolution of vascular plants: the ferns - part 23 of 28. describes the evolution of vascular systems in land plants. the highly specialized structures that occur in vascular plants are shown through investigation of the fern. explains the adaptive advanta - 木質部 個影片檔及 b 捲影像00:37
evolution of vascular plants: the ferns - part 21 of 28. describes the evolution of vascular systems in land plants. the highly specialized structures that occur in vascular plants are shown through investigation of the fern. explains the adaptive advanta - 木質部 個影片檔及 b 捲影像00:30
evolution of vascular plants: the ferns - part 19 of 28. describes the evolution of vascular systems in land plants. the highly specialized structures that occur in vascular plants are shown through investigation of the fern. explains the adaptive advanta - 木質部 個影片檔及 b 捲影像00:29
evolution of vascular plants: the ferns - part 18 of 28. describes the evolution of vascular systems in land plants. the highly specialized structures that occur in vascular plants are shown through investigation of the fern. explains the adaptive advanta - 木質部 個影片檔及 b 捲影像00:30
evolution of vascular plants: the ferns - part 17 of 28. describes the evolution of vascular systems in land plants. the highly specialized structures that occur in vascular plants are shown through investigation of the fern. explains the adaptive advanta - 木質部 個影片檔及 b 捲影像00:30
evolution of vascular plants: the ferns - part 16 of 28. describes the evolution of vascular systems in land plants. the highly specialized structures that occur in vascular plants are shown through investigation of the fern. explains the adaptive advanta - 木質部 個影片檔及 b 捲影像00:34
evolution of vascular plants: the ferns - part 15 of 28. describes the evolution of vascular systems in land plants. the highly specialized structures that occur in vascular plants are shown through investigation of the fern. explains the adaptive advanta - 木質部 個影片檔及 b 捲影像00:35
evolution of vascular plants: the ferns - part 14 of 28. describes the evolution of vascular systems in land plants. the highly specialized structures that occur in vascular plants are shown through investigation of the fern. explains the adaptive advanta - 木質部 個影片檔及 b 捲影像00:30
evolution of vascular plants: the ferns - part 13 of 28. describes the evolution of vascular systems in land plants. the highly specialized structures that occur in vascular plants are shown through investigation of the fern. explains the adaptive advanta - 木質部 個影片檔及 b 捲影像00:37
evolution of vascular plants: the ferns - part 12 of 28. describes the evolution of vascular systems in land plants. the highly specialized structures that occur in vascular plants are shown through investigation of the fern. explains the adaptive advanta - 木質部 個影片檔及 b 捲影像00:32
evolution of vascular plants: the ferns - part 11 of 28. describes the evolution of vascular systems in land plants. the highly specialized structures that occur in vascular plants are shown through investigation of the fern. explains the adaptive advanta - 木質部 個影片檔及 b 捲影像00:35
evolution of vascular plants: the ferns - part 10 of 28. describes the evolution of vascular systems in land plants. the highly specialized structures that occur in vascular plants are shown through investigation of the fern. explains the adaptive advanta - 木質部 個影片檔及 b 捲影像00:29
evolution of vascular plants: the ferns - part 8 of 28. describes the evolution of vascular systems in land plants. the highly specialized structures that occur in vascular plants are shown through investigation of the fern. explains the adaptive advantag - 木質部 個影片檔及 b 捲影像00:31
evolution of vascular plants: the ferns - part 6 of 28. describes the evolution of vascular systems in land plants. the highly specialized structures that occur in vascular plants are shown through investigation of the fern. explains the adaptive advantag - 木質部 個影片檔及 b 捲影像00:33
evolution of vascular plants: the ferns - part 5 of 28. describes the evolution of vascular systems in land plants. the highly specialized structures that occur in vascular plants are shown through investigation of the fern. explains the adaptive advantag - 木質部 個影片檔及 b 捲影像00:35
evolution of vascular plants: the ferns - part 4 of 28. describes the evolution of vascular systems in land plants. the highly specialized structures that occur in vascular plants are shown through investigation of the fern. explains the adaptive advantag - 木質部 個影片檔及 b 捲影像00:39
evolution of vascular plants: the ferns - part 3 of 28. describes the evolution of vascular systems in land plants. the highly specialized structures that occur in vascular plants are shown through investigation of the fern. explains the adaptive advantag - 木質部 個影片檔及 b 捲影像00:34
evolution of vascular plants: the ferns - part 2 of 28. describes the evolution of vascular systems in land plants. the highly specialized structures that occur in vascular plants are shown through investigation of the fern. explains the adaptive advantag - 木質部 個影片檔及 b 捲影像00:36
evolution of vascular plants: the ferns - part 1 of 28. describes the evolution of vascular systems in land plants. the highly specialized structures that occur in vascular plants are shown through investigation of the fern. explains the adaptive advantag - 木質部 個影片檔及 b 捲影像00:37
microscopic cross sectional view through woody stems to show vascular bundles, xylem, cambium, phloem - 木質部 個影片檔及 b 捲影像00:16
microscopic cross sectional view through woody stems to show vascular bundles, xylem, cambium, phloem - 木質部 個影片檔及 b 捲影像00:07
microscopic cross sectional view through woody stems to show vascular bundles, xylem, cambium, phloem - 木質部 個影片檔及 b 捲影像00:34
microscopic cross sectional view through woody stems to show vascular bundles, xylem, cambium, phloem - 木質部 個影片檔及 b 捲影像00:14
microscopic cross sectional view through woody stems to show vascular bundles, xylem, cambium, phloem - 木質部 個影片檔及 b 捲影像00:14
microscopic cross sectional view through woody stems to show vascular bundles, xylem, cambium, phloem - 木質部 個影片檔及 b 捲影像00:11
microscopic cross sectional view through woody stems to show vascular bundles, xylem, cambium, phloem - 木質部 個影片檔及 b 捲影像00:32
