File:Ancestors of the land vertebrates.jpg
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DescriptionAncestors of the land vertebrates.jpg |
English: The delta deposits indicate a warm humid climate with seasonal rainfall producing dry periods and stagnant, vegetation-choked pools. These conditions favored the development of air-breathing freshwater fishes, the Sarcopterygii, from which all higher vertebrates evolved. In one division, the Crossopterygii, the fins have fleshy lobes at their bases. These were forerunners of the limbs of terrestrial animals. Air-breathing fish with stout muscular fins, effective both in passage through thick aquatic vegetation and in short land journeys, would have a better chance for survival. The best known of such fish is Eusthenopteron seen here in the foreground. |
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Date | |||
Source | Flickr: Ancestors of the land vertebrates | ||
Author | Ellen | ||
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This file is licensed under the Creative Commons Attribution 2.0 Generic license.
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 16:12, 26 January 2011 | 1,098 × 1,465 (761 KB) | Flickr upload bot (talk | contribs) | Uploaded from http://flickr.com/photo/47051377@N00/4260285563 using Flickr upload bot |
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Camera manufacturer | Canon |
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Camera model | Canon PowerShot SD990 IS |
Exposure time | 1/160 sec (0.00625) |
F-number | f/2.8 |
ISO speed rating | 3,200 |
Date and time of data generation | 16:49, 9 January 2010 |
Lens focal length | 7.7 mm |
Orientation | Normal |
Horizontal resolution | 72 dpi |
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Software used | QuickTime 7.6.4 |
File change date and time | 17:44, 9 January 2010 |
Y and C positioning | Co-sited |
Exif version | 2.2 |
Date and time of digitizing | 16:49, 9 January 2010 |
Image compression mode | 5 |
APEX shutter speed | 7.3125 |
APEX aperture | 2.96875 |
APEX exposure bias | 0 |
Maximum land aperture | 2.96875 APEX (f/2.8) |
Metering mode | Pattern |
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