Why Is Cleopatra An Important Figure In History? Video
Cleopatra and Marc Anthony - Part 2/2 - Great Figures of History - See U in History Why Is Cleopatra An Important Figure In History?Some live on land, others are aquatic. Some fly, while others are earthbound.
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Some are vertebrates, others lack backbones. These creatures evolved separately and their common ancestors are far, far back in the evolutionary chain.
But they may share one fundamental feature: They dream. But no one really knows why. So until recently, the theory was that it evolved later in history, via an ancestor shared by birds and animals.
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But in active sleep was recorded in lizards. Then inthe state was described in cuttlefishand this March, a team of scientists in Brazil published a paper in iScience identifying it in octopuses.
Cephalopods like these evolved eons before the rise of creatures that would have shared a lineage with both birds and humans. Now scientists are wondering if this sleep state is more common than they initially realized, or if it developed in different species at different times, the way wings and flight arose separately in insects, bats, and birds, a phenomenon called convergent evolution.
Understanding which selective pressures caused this adaptation and the preservation of the genes that code for it could help scientists understand what function dreaming serves for the central nervous system and why sleep is important at all.
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The first step in studying how animals sleep is to figure out when they are, in fact, asleep. This is more complicated than it sounds. But octopuses have a highly distributed central nervous system.]
:max_bytes(150000):strip_icc()/aeschylus-56aaa8313df78cf772b462ca.jpg "Why Is Cleopatra An Important Figure In History?")
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