If not parents had a recessive type O allele, they would have a 1/4 or 25% chance of having a child with type O blood
Answer:
all 37 trillion cell in the body originates from a single fertilized egg called a zygote. The zygote divides repeatedly to produce an embryo. These embryonic cells continue to divide, differentiating into all the cell types present in the body of all humans (and other mammals), from a new-born baby to an elderly adult.
Climate change, habitat destruction, extinctions — thousands of years ago. And humans may have been partly to blame for many of those changes in nature, too. with a changing climate, led to the extinction of many species of megafauna about 12,000 years ago in the southern portion of what is now South America.
