Which of the following statements is generally true of aneuploidies in newborns? a. an aneuploidy resulting in the deletion of a chromosome segment is less serious than a duplication. b. human aneuploidy usually conveys an adaptive advantage in humans. c. a monosomy is more frequent than a trisomy. d. monosomy x is the only viable monosomy known to occur in humans.

d. Monosomy X is the only viable monosomy known to occur in humans.

Explanation:

Human have 22 pair of homologous chromosomoses and an extra pair of sex chromosomes. While in males  the sex  chromosomes  are X and  Y , females have two chromosomes X . Anyway, in normal conditions the total number of chromosomomes that humans have in their cells is 46 (23 pair of chromosomes).  

Aneuploidy is a biological condition where an individual have an abnormal number of chromosomes in their cells.  In humans for examples, this would be a human having more or less than 46 chromosomes.

The Turner syndrome also called  monosomy X is an aneuploidy  where  one of the X chromosomes is missing in a female.  Although under constant supervision, people with Turner syndrome have viable healthy lives. However this is the only monosomy that occur in humans that is compatible with life.  

i'd say that the moon rock is about 2.2 billion years old.