Some animals under the sea, like fish, have to filter the water. This is completely different to those animals with blowhole like the whale, the dolphins, etc.
Clic on this photo to see the animation about how the gills filter the water.
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Mateo
12 February, 2015 at 20:32
interesting
Nacho Herrero
3 October, 2017 at 10:44
Reblogged this on San Jose's Corner 3rd 4th Primary.