Do all pregnant woman undergo amniocentesis

No one is required to have this test. But an amniocentesis is generally offered to women in the following three categories But older woman like 35 and over are at higher risk of having a baby with chromosomal disorders

Explanation:

primary succession occurs in essentially lifeless areas regions in which the soil is incapable of sustaining life as a result of such factors as lava flows, newly formed sand dunes, or rocks left from a retreating glacier. secondary succession occurs

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