Scenario D: Anthropologist have been studying Y-chromosomal DNA to understand where and when humans first appeared and when they moved into various areas of the world. The Y chromosome is found only in males, and most of the DNA found on the Y chromosome is passed directly from fathers to sons. Researchers collect Y-chromosomal DNA from living men and measure the amount of genetic difference among populations. Greater amounts of genetic difference indicate longer periods of separation between different groups of people because it takes time to accumulate genetic variations. This Y-chromosomal DNA research has helped anthropologist to understand our species' origin and Africa and our various migrations to other parts of the world.

the right answer is a. skin cells forming from sunlight.

the liver is an organ endowed with a fantastic ability to regenerate

. thus, if a hepatectomy (ablation) of 70% of the hepatic mass is performed in the rat, there is complete recovery in 7 to 10 days.

prokaryotes are beings that have existed since the existence of life on earth, and do not come from another realm.

ribosomes are organelles that exist naturally in eukaryotes, either in free form or attached to the endoplasmic reticulum.

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ι вєℓινє тнє αиѕωєя тσ уσυя qυєѕтισи ιѕ в. ℓуѕσѕσмє

ι нσρє тнαт ι ¢συℓ∂ нєℓρ уσυ.

he movement of air through earth's or any planet's atmosphere is called wind, and the main cause of earth's winds is uneven heating by the sun. this uneven heating causes changes of atmospheric pressure, and winds blow from regions with high pressure to those with low pressure.

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