00:00Shark reproduction is another example of evolutionary ingenuity.
00:03Among sharks, you can find almost every form of reproduction found in nature.
00:08There are egg-laying sharks.
00:10They lay eggs in tough capsules that look like mermaids' purses.
00:15There are also live-bearing sharks.
00:17Their embryos develop inside the mother,
00:19receiving nourishment through a structure similar to a placenta.
00:23And there are ovoviviparous sharks,
00:25where the eggs hatch right inside the mother's body
00:27and fully formed young sharks are born.
00:30In some species, the embryos even start feeding on their siblings in the womb,
00:34so to speak, natural selection before birth.
00:37Even in breathing, sharks have their own peculiarities.
00:40Unlike most fish, which actively pump water through their gills,
00:44many sharks are forced to swim constantly
00:46so that water passes through their gill slits.
00:49Stopping for such species means suffocation.
00:52However, their gills work with fantastic efficiency.
00:55They extract up to 80% of oxygen from the water.
00:59Some species migrate thousands of kilometers.
01:02This requires a precise sense of orientation.
01:05And sharks really do have it.
01:07Research shows that they navigate by the Earth's magnetic field,
01:11using their electrosensory organs as a navigation system.
01:15It's like an internal compass that works flawlessly even in the ocean,
01:19where there are no landmarks.
01:20there are no coefficients,植出
01:21to findолог Transport, there is a
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