Cartilaginous fish – 455 species of sharks
Cartilaginous fish – 455 species of sharks – Found fossils show that sharks
living today belong to a group of cartilaginous fish. There are still very similar to their ancestors
who existed 150 million years ago. According to experts, currently in the waters of the seas
and oceans live 455 species of sharks. Joe Quattro professor of biology at
the University of South Carolina. In 2006 he discovered species, which is very similar to the
famous hammerhead sharks, but differs from it in terms of genetics.
Antarctic temperature changes
Antarctic temperature changes – Researchers at the University of Washington in Seattle (USA),
after analyzing data from satellites observing Antarctica, came to the conclusion that Antarctica
warmed by 0.5 ° C between 1957 and 2006. Scientists noticed that the temperature
quickly rises to the west Antarctica. Heating the continent has an impact on rising sea levels.
Whale skin – Sensitive to sunlight
Whale skin – Sensitive to sunlight – Whales skin is just as sensitive to sunlight as humans. Researchers from Newcastle University and the Mexican and Canadian marine biologists drew attention to the blisters of these sea animals. In most cases, they were not infected, which means that the cause must be sought elsewhere – UV. Due to the fact that the blue whales are light skin tone, immediately appear on the changes caused by UV radiation – to increase the amount of pigment and mitochondrial DNA damage. Sperm whales spend for more time on the water surface, which also will not miss the effects of sunlight, even though their skin is much darker.