I, BM
299 792 458 m·s^−1 6.67384(80)×10−11 m³·kg^−1·s−2 6.626 069 57(29) × 10^−34 J·s 1.054 571 726(47) × 10^−34 J·s 4π × 10^−7 N·A^−2 = 1.256 637 061... × 10^−6 N·A^−2 8.854 187 817... × 10^−12 F·m−1 376.730 313 461... Ω 8.987 551 787... × 109 N·m²·C^−2 1.602 176 565(35) × 10^−19 C 9.274 009 68(20) × 10^−24 J·T^−1 7.748 091 7346(25) × 10^−5 S 12 906.403 7217(42) Ω 4.835 978 70(11) × 10^14 Hz·V−1 2.067 833 758(46) × 10^−15 Wb 5.050 783 53(11) × 10^−27 J·T^−1 25 812.807 4434(84) Ω 5.291 772 1092(17) × 10^−11 m 2.817 940 3267(27) × 10^−15 m 9.109 382 91(40) × 10^−31 kg 1.166 364(5) × 10^−5 GeV^−2 7.297 352 5698(24) × 10^−3 4.359 744 34(19) × 10^−18 J 1.672 621 777(74) × 10^−27 kg 3.636 947 5520(24) × 10^−4 m² s^−1 10 973 731.568 539(55) m^−1 6.652 458 734(13) × 10^−29 m² 0.2223(21) 1.660 538 921(73) × 10^−27 kg 6.022 141 29(27) × 10^23 mol^−1
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A sea biscuit's life.
Posted 11-17-2008 at 02:47 PM by Bullet Magnet
Clypeaster subdepressus, more commonly known as the sea biscuit or sand dollar, is a common coastal Echinoid, or sea urchin. Echinoderms like these are deuterostomes like us, meaning we are more closely related to them than the seemingly more similar arthropods, annelid worms and molluscs, who at least have a complete nervous system and unfailingly both a mouth and and anus.
This charming video portrays the beautiful development cycle of a sea biscuit from fertilisation to final metamorphosis. The process is fairly typical of Echinoderms, though different classes (such as starfish, brittle stars, sea cucumbers etc) have different shaped larval stages. |
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Recent Blog Entries by Bullet Magnet
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