Which type of printer uses tiny heated nozzles to squirt ink…
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Which type оf printer uses tiny heаted nоzzles tо squirt ink onto the pаper?
During which phаse оf mitоsis is the DNA replicаted?
A Cаve Mystery Abоut Hоmо Nаledi1 | In 2013, scientists found bones from more thаn 20 ancient human relatives in the Rising Star Cave2 | system in South Africa. These relatives are called Homo naledi, they lived about 335,000 to 236,0003 | years ago. They were small, and their brains only about the size of a chimpanzee’s brain.4 | For years, scientists debated how the bones got so deep inside the caves. Some researchers5 | the individuals may have fallen in by accident, but others believed they were placed there6 | after death.7 | Researchers recently studied proteins from 23 teeth found in the cave system. The teeth came8 | from babies, children, and adults, so the sample included many ages. The researchers looked for9 | proteins in dental enamel, which is the hard outside part of a tooth. In humans, one protein is10 | connected to the X chromosome another is connected to the Y chromosome. Because males11 | usually have the Y-chromosome protein, so scientists can often use teeth to learn whether an12 | individual was male or female.13 | The surprising result was that every tooth sample seemed to come from a female. If this14 | happened by chance, it would be like flipping a coin many times and getting the same side every15 | time. That is incredibly unlikely, some scientists think the cave was probably used as a place for16 | the dead.17 | This idea is important because Homo naledi had a much smaller brain than modern humans. If18 | these early humans buried their dead, they may have had social behavior that was more complex19 | than many people expected. They may also have treated females in a special way after death, 20 | scientists still do not know why.21 | The study also raises a new question: where are the males? Male Homo naledi may be buried in22 | another cave scientists may already have found male fossils without recognizing them. If males23 | looked larger or different from females, researchers may have placed those fossils in the wrong24 | group.25 | For now, the discovery does not answer every question, but it changes how scientists think about26 | Homo naledi.