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Biology, 22.06.2019 18:00
The table below shows the elements that mainly comprise each of the four layers of earth: elements in layers layer main elements crust oxygen, silicon mantle iron, magnesium outer core iron, nickel inner core iron which of these elements make up the layer that is 0.2 to 1.1 percent of earth's total diameter?
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Biology, 23.06.2019 01:00
In 1994, telomerase activity was discovered in human cancer cell lines. although telomerase activity is rarely present in human somatic tissue, this discovery indicated that humans do contain the genes for telomerase proteins and telomerase rna. since inappropriate activation of telomerase may contribute to cancer, why do you think the genes coding for this enzyme have been maintained in the human genome throughout evolution?
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Biology, 23.06.2019 11:00
Explain why stem cell research is a controversial subject. what are some of the sources for stem cells?
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Biology, 23.06.2019 11:00
A. review what is evolution? b. apply concepts what ideas were changing in the scientific community at the time of darwin's travels? how might those new ideas have influenced darwin? 7. a. review what three kinds of variations among organisms did darwin observe during the voyage of the beagle? b. infer darwin found fossils of many organisms that did not resemble any living species. how might this finding have affected his understanding of life's diversity? apply the big idea: interdependence in nature 8. you have learned that both biotic and abiotic factors affect ecosystems. give some examples of each, and explain how biotic and abiotic factors could have affected the tortoises that darwin observed on the galápagos islands.
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Type a paragraph summarizing cellular division and differentiation
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