What are two ways in which ultrasound technology produces images? A. By detecting the frequencies of emitted sound waves
B. By using sound in frequencies that reflect off body tissues
C. By measuring the time it takes for reflected sound waves to be
detected
D. By the absorption of sound waves in the body

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thrombocytopenia, which is a deficiency in blood platelets, can cause bleeding and bruising in the dermis similar to senile purpura. other possible causes include: exposure to ultraviolet rays and aging skin are common causes of senile purpura. senile purpura may also be a sign of collagen loss in the skin and bones.

the correct answer is b

this age may represent the age of the earth's accretion, of core formation, or of the material from which the earth formed. this dating is based on evidence from radiometric age-dating of meteorite material and is consistent with the radiometric ages of the oldest-known terrestrial and lunar samples.