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Drug Dosage: The authors and the publisher have exerted every effort to ensure that drug selection and dosage set forth in this text are in accord with current recommendations and practice at the time of publication.

However, several types of "fish" lack a couple of features possessed by most: notably jaws and a skull and backbone reinforced by true bone (which is hardened by a mineral called calcium hydroxylapatite).

Under Linnaean taxonomy, these jawless fish (which include modern lampreys and hagfish) are put in a superclass called Agnatha.

It's wonderful to see the little blob with a heartbeat that will become your baby.A vaginal scan is done by introducing a probe into your vagina. Abdominal scan After 10 weeks and for the rest of your pregnancy, you will have an abdominal scan.However, if the doctor needs to check your cervix (mouth of uterus and birth canal), a transvaginal scan may be done as it is more accurate.Embryonic crown-rump length (CRL), heart rate (HR), gestational sac diameter (GSD) and yolk sac diameter (YSD) were compared in two groups of women with singleton pregnancies attending an early pregnancy unit.In the first group the initial scan demonstrated a live embryo but in a subsequent visit the scan showed a dead embryo, complete or incomplete miscarriage.Logistic regression analysis demonstrated that in the prediction of miscarriage the risk was higher in women of African racial origin [odds ratio (OR) 1.62], cigarette smokers (OR 1.91) and those with vaginal bleeding (OR 2.03) and increased with maternal age (OR 1.05) and YSD (OR 1.88) and was inversely related to CRL (OR 0.79), HR (OR 0.96) and GSD (OR 0.84).

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