Spontaneous miscarriage in the first trimester is related to Chromosomal defects in the fetus. An estimated 15 to 20 percent of known pregnancies end in miscarriage, the loss of a pregnancy before the 20th week. Upto 70 percent of first-trimester miscarriages, and 20 percent of second-trimester miscarriages, are caused by chromosomal anomalies/abnormalities in the fertilized egg. Most often, it means that the egg or sperm had wrong number of chromosomes, and consequently the fertilized egg can't develop normally.
Answer:
D fossil record
Explanation:
Depending on what layer of earth the fossil was recorded then they could determine a rough date. Then they would use carbon dating to be more exact.
Answer:
Ambitious
DNA determines the fate of each cell.
DNA is the basic genetic unit for each cell and contains information about the fate of the cell. The DNA of daughter cell which remains in stem cell state and continues to divide causes production of those substances which promote it to stay in stem cell state and also promote its continuous division. On the other hand, the DNA of specialized cell causes production of substances which changes characteristics of the cell and causes it to become a mature and specialized cell.
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Explanation:
I would say C if thats not right then its problable D
