21.   Ultrasound is used to determine the age of the fetus, and the cost of the abortion goes up depending on its age.

22.   Ultrasound tests are given to determine the age of the fetus and thus indicate the best procedure to use to end the pregnancy.

23.   With accelerator mass spectrometry, scientists can determine the age of samples as small as one-thousandth the size of those required for the conventional method.

24.   A surface rover that would determine the ages of geological materials and send the information to Earth.

25.   A surface rover that would determine the ages of geological materials and send the information back to Earth.

26.   Eaves said an autopsy would be done to determine the age of the infant, and about when he or she died.

27.   Haddow noted that first-trimester screening requires an ultrasound exam to determine the age of the fetus, while blood testing in the second trimester does not.

28.   His research on isotopic measurements of helium, argon and xenon helped determine the age of rocks and meteorites, and provided a chronology for the early solar system.

29.   In a way, the gulls are better to study because their age can be determined by the color of their plumage, which changes from brown to white.

30.   Raja Aziz then asked whether Lim could determine the age of the semen stains he examined.